Support Canary Release

[Bryce-huang]

#487

[Bryce-huang]

This PR is ready for review, it works for me well.

apiVersion: core.openfunction.io/v1beta2
kind: Function
metadata:
  name: test-server
spec:
  canarySteps:
  - weight: 20
    pause:
      duration: 60
  - weight: 80
     pause:
      duration: 120
  image: brycehuang/web-service-image:v1
  serving:
    template:
      containers:
      - imagePullPolicy: IfNotPresent
        name: function
  version: latest
  workloadRuntime: OCIContaine

After modifying the image brycehuang/web-service-image:v1 to brycehuang/web:v2, start the canary release. You can observe the changes in httproute. After about 3 minutes, the canary release is completed.

[benjaminhuo]

The e2e test has know issues which is still failing, it's ok not to fix it now.
But it's better to fix https://github.com/OpenFunction/OpenFunction/actions/runs/6109785188/job/16581498056?pr=490 maybe :) @Bryce-huang

[benjaminhuo]

@Bryce-huang Is this ready for review?

[Bryce-huang]

@Bryce-huang Is this ready for review?

Yes,I'm also doing tests.

[benjaminhuo]

@Bryce-huang Is this ready for review?

Yes,I'm also doing tests.

@wrongerror @wanjunlei @tpiperatgod @lizzzcai would you help to review this?

[benjaminhuo]

I would suggest the following changes:
@Bryce-huang @wrongerror @wanjunlei @tpiperatgod @lizzzcai what do you think?

apiVersion: core.openfunction.io/v1beta2
kind: Function
metadata:
  name: test-server
spec:
  rolloutStrategy:
    canary:
      steps:
      - weight: 20
        pause:
          duration: 60
      - weight: 80
        pause:
          duration: 120
  image: brycehuang/web-service-image:v1
  serving:
    template:
      containers:
      - imagePullPolicy: IfNotPresent
        name: function
  version: latest
  workloadRuntime: OCIContainer
status:
  # status.serving and status.revision should always be the stable serving and revision
  # status.canary.serving and status.canary.revision should be the canary ones
  serving:
  revision: 
  rollout:
    canary:
      status: # CanaryStatus
      serving:
      revision:

[Bryce-huang]

I would suggest the following changes: @Bryce-huang @wrongerror @wanjunlei @tpiperatgod @lizzzcai what do you think?

apiVersion: core.openfunction.io/v1beta2
kind: Function
metadata:
  name: test-server
spec:
  rolloutStrategy:
    canary:
      steps:
      - weight: 20
        pause:
          duration: 60
      - weight: 80
        pause:
          duration: 120
  image: brycehuang/web-service-image:v1
  serving:
    template:
      containers:
      - imagePullPolicy: IfNotPresent
        name: function
  version: latest
  workloadRuntime: OCIContainer
status:
  # status.serving and status.revision should always be the stable serving and revision
  # status.canary.serving and status.canary.revision should be the canary ones
  serving:
  revision: 
  rollout:
    canary:
      status: # CanaryStatus
      serving:
      revision:

LGTM