build: reduce container image size

- Remove Go source files
- Install only the Dart executable

.github/workflows/ci.yml

@@ -112,6 +112,10 @@ jobs:
         run: |
           docker load <"/tmp/${{ env.CONTAINER_IMAGE_OUTPUT_IMAGE_NAME }}.tar"
 
+      - name: Print environment info
+        run: |
+          make info
+
       - name: Test Local Action (debug log)
         uses: ./
         env:

Dockerfile

@@ -353,9 +353,35 @@ COPY --from=clj-kondo /bin/clj-kondo /usr/bin/
 ####################
 # Install dart-sdk #
 ####################
+# These COPY directives may be compacted after --parents is supported
 ENV DART_SDK /usr/lib/dart
-COPY --from=dart "${DART_SDK}" "${DART_SDK}"
-RUN chmod 755 "${DART_SDK}" && chmod 755 "${DART_SDK}/bin"
+COPY --from=dart --chmod=0755 \
+    "${DART_SDK}/version" \
+    "${DART_SDK}"/
+COPY --from=dart --chmod=0755 \
+    "${DART_SDK}/bin/dart" \
+    "${DART_SDK}/bin/dart.sym" \
+    "${DART_SDK}/bin"/
+COPY --from=dart --chmod=0755 \
+    "${DART_SDK}/bin/snapshots/analysis_server.dart.snapshot" \
+    "${DART_SDK}/bin/snapshots/dartdev.dart.snapshot" \
+    "${DART_SDK}/bin/snapshots/frontend_server_aot.dart.snapshot" \
+    "${DART_SDK}/bin/snapshots"/
+COPY --from=dart --chmod=0755 \
+    "${DART_SDK}/lib/_internal" \
+    "${DART_SDK}/lib/_internal"
+COPY --from=dart --chmod=0755 \
+    "${DART_SDK}/lib/async" \
+    "${DART_SDK}/lib/async"
+COPY --from=dart --chmod=0755 \
+    "${DART_SDK}/lib/convert" \
+    "${DART_SDK}/lib/convert"
+COPY --from=dart --chmod=0755 \
+    "${DART_SDK}/lib/core" \
+    "${DART_SDK}/lib/core"
+COPY --from=dart --chmod=0755 \
+    "${DART_SDK}/lib/io" \
+    "${DART_SDK}/lib/io"
 
 ########################
 # Install clang-format #

Makefile

@@ -14,14 +14,6 @@ ifeq ($(INTERACTIVE), 1)
 	DOCKER_FLAGS += -t
 endif
 
-.PHONY: info
-info: ## Gather information about the runtime environment
-	echo "whoami: $$(whoami)"; \
-	echo "pwd: $$(pwd)"; \
-	echo "ls -ahl: $$(ls -ahl)"; \
-	docker images; \
-	docker ps
-
 .PHONY: help
 help: ## Show help
 	@grep -E '^[a-zA-Z_-]+:.*?## .*$$' $(MAKEFILE_LIST) | sort | awk 'BEGIN {FS = ":.*?## "}; {printf "\033[36m%-30s\033[0m %s\n", $$1, $$2}'
@@ -79,13 +71,27 @@ endif
 
 DEV_CONTAINER_URL := "super-linter/dev-container:latest"
 
-
 ifeq ($(GITHUB_HEAD_REF),)
 RELEASE_PLEASE_TARGET_BRANCH := "$(shell git branch --show-current)"
 else
 RELEASE_PLEASE_TARGET_BRANCH := "${GITHUB_HEAD_REF}"
 endif
 
+.PHONY: info
+info: ## Gather information about the runtime environment
+	echo "whoami: $$(whoami)"; \
+	echo "pwd: $$(pwd)"; \
+	echo "ls -ahl: $$(ls -ahl)"; \
+	docker images; \
+	docker ps; \
+	echo "Container image layers size:"; \
+	docker history \
+		--human \
+		--no-trunc \
+		--format "{{.Size}} {{.CreatedSince}} {{.CreatedBy}}" \
+		$(SUPER_LINTER_TEST_CONTAINER_URL) \
+		| sort --human
+
 .PHONY: check-github-token
 check-github-token:
 	@if [ ! -f "${GITHUB_TOKEN_PATH}" ]; then echo "Cannot find the file to load the GitHub access token: $(GITHUB_TOKEN_PATH). Create a readable file there, and populate it with a GitHub personal access token."; exit 1; fi