auth/registry: add integration tests

Signed-off-by: Sanskar Jaiswal <jaiswalsanskar078@gmail.com>

auth/registry/tests/integration/.env.sample

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+## AWS
+# export AWS_ACCESS_KEY_ID=
+# export AWS_SECRET_ACCESS_KEY=
+# export AWS_REGION=us-east-2
+## This terraform variable should be different from
+## the region set above.
+# export TF_VAR_cross_region=us-east-1
+## This random value is needed for AWS only to prevent
+## https://github.com/hashicorp/terraform-provider-aws/issues/19583 which
+## happens when using dynamic "name" value in presence of more than one tag.
+# export TF_VAR_rand=${RANDOM}
+
+## Azure
+# export TF_VAR_azure_location=eastus
+## Set the following only when authenticating using Service Principal (suited
+## for CI environment).
+# export ARM_CLIENT_ID=
+# export ARM_CLIENT_SECRET=
+# export ARM_SUBSCRIPTION_ID=
+# export ARM_TENANT_ID=
+
+## GCP
+# export TF_VAR_gcp_project_id=
+# export TF_VAR_gcp_region=us-central1
+# export TF_VAR_gcp_zone=us-central1-c
+## Leave GCR region empty to use gcr.io. Else set it to `us`, `eu` or `asia`.
+# export TF_VAR_gcr_region=
+## Set the following only when using service account.
+## Provide absolute path to the service account JSON key file.
+# export GOOGLE_APPLICATION_CREDENTIALS=
+
+## Common variables
+# export TF_VAR_tags='{"environment"="dev"}'
+#
+## WARNING: For AWS, also set the "createdat" tag to overwrite the default
+## timestamp and use a static value. Dynamic tag value causes the issue
+## https://github.com/hashicorp/terraform-provider-aws/issues/19583.
+## The date format is based on the format defined in
+## fluxcd/test-infra/tf-modules/utils/tags tf-module that's compatible with the
+## tags/labels value in all the cloud providers.
+## Also, since "createdat" is a dynamic value, its value changes on subsequent
+## apply. Overriding it with a static value helps avoid modifying the resource
+## tags during development when the configurations are applied frequently.
+# export TF_VAR_tags='{"environment"="dev", "createdat"='"\"$(date -u +x%Y-%m-%d_%Hh%Mm%Ss)\""'}'

auth/registry/tests/integration/.gitignore

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+app
+.env
+build
+.terraform*
+terraform.tfstate*

auth/registry/tests/integration/Dockerfile

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+# Using scratch base image results in `x509: certificate signed by unknown
+# authority` error.
+# Use alpine to include the necessary certificates.
+FROM alpine:3.16
+
+COPY app .
+
+ENTRYPOINT ["/app"]

auth/registry/tests/integration/Makefile

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+GO_TEST_ARGS ?=
+PROVIDER_ARG ?=
+TEST_TIMEOUT ?= 30m
+GOARCH ?= amd64
+GOOS ?= linux
+
+TEST_IMG ?= fluxcd/testapp:test
+
+.PHONY: app
+app:
+	CGO_ENABLED=0 GOARCH=$(GOARCH) GOOS=$(GOOS) go build -o app ./testapp
+
+docker-build: app
+	docker buildx build -t $(TEST_IMG) --load .
+
+test:
+	docker image inspect $(TEST_IMG) >/dev/null
+	TEST_IMG=$(TEST_IMG) go test -timeout $(TEST_TIMEOUT) -v ./ $(GO_TEST_ARGS) $(PROVIDER_ARG) --tags=integration
+
+test-aws:
+	$(MAKE) test PROVIDER_ARG="-provider aws"
+
+test-azure:
+	$(MAKE) test PROVIDER_ARG="-provider azure"
+
+test-gcp:
+	$(MAKE) test PROVIDER_ARG="-provider gcp"

auth/registry/tests/integration/README.md

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+# OCI integration test
+
+OCI integration test uses a test application(`testapp/`) to test the
+oci package against each of the supported cloud providers.
+
+**NOTE:** Tests in this package aren't run automatically by the `test-*` make
+target at the root of `fluxcd/pkg` repo. These tests are more complicated than
+the regular go tests as it involves cloud infrastructure and have to be run
+explicitly.
+
+Before running the tests, build the test app with `make docker-build` and use
+the built container application in the integration test.
+
+The integration test provisions cloud infrastructure in a target provider and
+runs the test app as a batch job which tries to log in and list tags from the
+test registry repository. A successful job indicates successful test. If the job
+fails, the test fails.
+
+Logs of a successful job run:
+```console
+$ kubectl logs test-job-93tbl-4jp2r
+2022/07/28 21:59:06 repo: xxx.dkr.ecr.us-east-2.amazonaws.com/test-repo-flux-test-heroic-ram
+1.659045546831094e+09   INFO    logging in to AWS ECR for xxx.dkr.ecr.us-east-2.amazonaws.com/test-repo-flux-test-heroic-ram
+2022/07/28 21:59:06 logged in
+2022/07/28 21:59:06 tags: [v0.1.4 v0.1.3 v0.1.0 v0.1.2]
+```
+
+## Requirements
+
+### Amazon Web Services
+
+- AWS account with access key ID and secret access key with permissions to
+    create EKS cluster and ECR repository.
+- AWS CLI v2.x, does not need to be configured with the AWS account.
+- Docker CLI for registry login.
+- kubectl for applying certain install manifests.
+
+### Microsoft Azure
+
+- Azure account with an active subscription to be able to create AKS and ACR,
+    and permission to assign roles. Role assignment is required for allowing AKS
+    workloads to access ACR.
+- Azure CLI, need to be logged in using `az login` as a User (not a Service
+  Principal).
+
+  **NOTE:** To use Service Principal (for example in CI environment), set the
+  `ARM-*` variables in `.env`, source it and authenticate Azure CLI with:
+  ```console
+  $ az login --service-principal -u $ARM_CLIENT_ID -p $ARM_CLIENT_SECRET --tenant $ARM_TENANT_ID
+  ```
+  In this case, the AzureRM client in terraform uses the Service Principal to
+  authenticate and the Azure CLI is used only for authenticating with ACR for
+  logging in and pushing container images. Attempting to authenticate terraform
+  using Azure CLI with Service Principal results in the following error:
+  > Authenticating using the Azure CLI is only supported as a User (not a Service Principal).
+- Docker CLI for registry login.
+- kubectl for applying certain install manifests.
+
+#### Permissions
+
+Following permissions are needed for provisioning the infrastructure and running
+the tests:
+- `Microsoft.Kubernetes/*`
+- `Microsoft.Resources/*`
+- `Microsoft.Authorization/roleAssignments/{Read,Write,Delete}`
+- `Microsoft.ContainerRegistry/*`
+- `Microsoft.ContainerService/*`
+
+#### IAM and CI setup
+
+To create the necessary IAM role with all the permissions, set up CI secrets and
+variables using
+[azure-gh-actions](https://github.com/fluxcd/test-infra/tree/main/tf-modules/azure/github-actions)
+use the terraform configuration below. Please make sure all the requirements of
+azure-gh-actions are followed before running it.
+
+```hcl
+provider "github" {
+  owner = "fluxcd"
+}
+
+module "azure_gh_actions" {
+  source = "git::https://github.com/fluxcd/test-infra.git//tf-modules/azure/github-actions"
+
+  azure_owners          = ["owner-id-1", "owner-id-2"]
+  azure_app_name        = "pkg-oci-e2e"
+  azure_app_description = "pkg oci e2e"
+  azure_permissions = [
+    "Microsoft.Kubernetes/*",
+    "Microsoft.Resources/*",
+    "Microsoft.Authorization/roleAssignments/Read",
+    "Microsoft.Authorization/roleAssignments/Write",
+    "Microsoft.Authorization/roleAssignments/Delete",
+    "Microsoft.ContainerRegistry/*",
+    "Microsoft.ContainerService/*"
+  ]
+  azure_location = "eastus"
+
+  github_project = "pkg"
+
+  github_secret_client_id_name       = "OCI_E2E_AZ_ARM_CLIENT_ID"
+  github_secret_client_secret_name   = "OCI_E2E_AZ_ARM_CLIENT_SECRET"
+  github_secret_subscription_id_name = "OCI_E2E_AZ_ARM_SUBSCRIPTION_ID"
+  github_secret_tenant_id_name       = "OCI_E2E_AZ_ARM_TENANT_ID"
+}
+```
+
+**NOTE:** The environment variables used above are for the GitHub workflow that
+runs the tests. Change the variable names if needed accordingly.
+
+### Google Cloud Platform
+
+- GCP account with project and GKE, GCR and Artifact Registry services enabled
+    in the project.
+- gcloud CLI, need to be logged in using `gcloud auth login` as a User (not a
+  Service Account), configure application default credentials with `gcloud auth
+  application-default login` and docker credential helper with `gcloud auth configure-docker`.
+
+  **NOTE:** To use Service Account (for example in CI environment), set
+  `GOOGLE_APPLICATION_CREDENTIALS` variable in `.env` with the path to the JSON
+  key file, source it and authenticate gcloud CLI with:
+  ```console
+  $ gcloud auth activate-service-account --key-file=$GOOGLE_APPLICATION_CREDENTIALS
+  ```
+  Depending on the Container/Artifact Registry host used in the test, authenticate
+  docker accordingly
+  ```console
+  $ gcloud auth print-access-token | docker login -u oauth2accesstoken --password-stdin https://us-central1-docker.pkg.dev
+  $ gcloud auth print-access-token | docker login -u oauth2accesstoken --password-stdin https://gcr.io
+  ```
+  In this case, the GCP client in terraform uses the Service Account to
+  authenticate and the gcloud CLI is used only to authenticate with Google
+  Container Registry and Google Artifact Registry.
+
+  **NOTE FOR CI USAGE:** When saving the JSON key file as a CI secret, compress
+  the file content with
+  ```console
+  $ cat key.json | jq -r tostring
+  ```
+  to prevent aggressive masking in the logs. Refer
+  [aggressive replacement in logs](https://github.com/google-github-actions/auth/blob/v1.1.0/docs/TROUBLESHOOTING.md#aggressive--replacement-in-logs)
+  for more details.
+- Docker CLI for registry login.
+- kubectl for applying certain install manifests.
+
+**NOTE:** Unlike ECR, AKS and Google Artifact Registry, Google Container
+Registry tests don't create a new registry. It pushes to an existing registry
+host in a project, for example `gcr.io`. Due to this, the test images pushed to
+GCR aren't cleaned up automatically at the end of the test and have to be
+deleted manually. [`gcrgc`](https://github.com/graillus/gcrgc) can be used to
+automatically delete all the GCR images.
+```console
+$ gcrgc gcr.io/<project-name>
+```
+
+#### Permissions
+
+Following roles are needed for provisioning the infrastructure and running the
+tests:
+- Artifact Registry Administrator - `roles/artifactregistry.admin`
+- Compute Instance Admin (v1) - `roles/compute.instanceAdmin.v1`
+- Compute Storage Admin - `roles/compute.storageAdmin`
+- Kubernetes Engine Admin - `roles/container.admin`
+- Service Account Admin - `roles/iam.serviceAccountAdmin`
+- Service Account Token Creator - `roles/iam.serviceAccountTokenCreator`
+- Service Account User - `roles/iam.serviceAccountUser`
+- Storage Admin - `roles/storage.admin`
+
+#### IAM and CI setup
+
+To create the necessary IAM role with all the permissions, set up CI secrets and
+variables using
+[gcp-gh-actions](https://github.com/fluxcd/test-infra/tree/main/tf-modules/gcp/github-actions)
+use the terraform configuration below. Please make sure all the requirements of
+gcp-gh-actions are followed before running it.
+
+```hcl
+provider "google" {}
+
+provider "github" {
+  owner = "fluxcd"
+}
+
+module "gcp_gh_actions" {
+  source = "git::https://github.com/fluxcd/test-infra.git//tf-modules/gcp/github-actions"
+
+  gcp_service_account_id   = "pkg-oci-e2e"
+  gcp_service_account_name = "pkg-oci-e2e"
+  gcp_roles = [
+    "roles/artifactregistry.admin",
+    "roles/compute.instanceAdmin.v1",
+    "roles/compute.storageAdmin",
+    "roles/container.admin",
+    "roles/iam.serviceAccountAdmin",
+    "roles/iam.serviceAccountTokenCreator",
+    "roles/iam.serviceAccountUser",
+    "roles/storage.admin"
+  ]
+
+  github_project = "pkg"
+
+  github_secret_credentials_name = "OCI_E2E_GOOGLE_CREDENTIALS"
+}
+```
+
+**NOTE:** The environment variables used above are for the GitHub workflow that
+runs the tests. Change the variable names if needed accordingly.
+
+## Test setup
+
+Copy `.env.sample` to `.env`, put the respective provider configurations in the
+environment variables and source it, `source .env`.
+
+Ensure the test app container image is built and ready for testing. Test app
+container image can be built with make target `docker-build`.
+
+Run the test with `make test-*`, setting the test app image with variable
+`TEST_IMG`. By default, the default test app container image,
+`fluxcd/testapp:test`, will be used.
+
+```console
+$ make test-azure
+make test PROVIDER_ARG="-provider azure"
+docker image inspect fluxcd/testapp:test >/dev/null
+TEST_IMG=fluxcd/testapp:test go test -timeout 30m -v ./ -verbose -retain -provider azure --tags=integration
+2022/07/29 02:06:51 Terraform binary:  /usr/bin/terraform
+2022/07/29 02:06:51 Init Terraform
+...
+```
+
+## Debugging the tests
+
+For debugging environment provisioning, enable verbose output with `-verbose`
+test flag.
+
+```console
+$ make test-aws GO_TEST_ARGS="-verbose"
+```
+
+The test environment is destroyed at the end by default. Run the tests with
+`-retain` flag to retain the created test infrastructure.
+
+```console
+$ make test-aws GO_TEST_ARGS="-retain"
+```
+
+The tests require the infrastructure state to be clean. For re-running the tests
+with a retained infrastructure, set `-existing` flag.
+
+```console
+$ make test-aws GO_TEST_ARGS="-retain -existing"
+```
+
+To delete an existing infrastructure created with `-retain` flag:
+
+```console
+$ make test-aws GO_TEST_ARGS="-existing"
+```