使用 GitHub Actions 添加图像注释

注释允许您为 OCI 图像组件指定任意元数据，例如清单、索引和描述符。

要在使用 GitHub Actions 构建图像时添加注释，请使用元数据操作自动创建符合 OCI 的注释。元数据操作创建一个annotations您可以引用的输出，无论是 build-push-action还是 Baker-action。

name: ci

on:
  push:
    branches:
      - "main"

env:
  IMAGE_NAME: user/app

jobs:
  docker:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout
        uses: actions/checkout@v4

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v3

      - name: Login to Docker Hub
        uses: docker/login-action@v3
        with:
          username: ${{ secrets.DOCKERHUB_USERNAME }}
          password: ${{ secrets.DOCKERHUB_TOKEN }}

      - name: Extract metadata
        id: meta
        uses: docker/metadata-action@v4
        with:
          images: ${{ env.IMAGE_NAME }}

      - name: Build and push
        uses: docker/build-push-action@v5
        with:
          tags: ${{ steps.meta.outputs.tags }}
          annotations: ${{ steps.meta.outputs.annotations }}
          push: true

name: ci

on:
  push:
    branches:
      - "main"

env:
  IMAGE_NAME: user/app

jobs:
  docker:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout
        uses: actions/checkout@v4

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v3

      - name: Login to Docker Hub
        uses: docker/login-action@v3
        with:
          username: ${{ secrets.DOCKERHUB_USERNAME }}
          password: ${{ secrets.DOCKERHUB_TOKEN }}

      - name: Extract metadata
        id: meta
        uses: docker/metadata-action@v4
        with:
          images: ${{ env.IMAGE_NAME }}

      - name: Build
        uses: docker/bake-action@v3
        with:
          files: |
            ./docker-bake.hcl
            ${{ steps.meta.outputs.bake-file-tags }}
            ${{ steps.meta.outputs.bake-file-annotations }}            
          push: true

配置注释级别

默认情况下，注释放置在图像清单上。要配置注释级别，请将步骤DOCKER_METADATA_ANNOTATIONS_LEVELS上的环境变量设置metadata-action为要注释的所有级别的逗号分隔列表。例如，设置DOCKER_METADATA_ANNOTATIONS_LEVELS为 index会导致图像索引上的注释而不是清单上的注释。

以下示例在图像索引和清单上创建注释。

name: ci

on:
  push:
    branches:
      - "main"

env:
  IMAGE_NAME: user/app

jobs:
  docker:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout
        uses: actions/checkout@v4

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v3

      - name: Login to Docker Hub
        uses: docker/login-action@v3
        with:
          username: ${{ secrets.DOCKERHUB_USERNAME }}
          password: ${{ secrets.DOCKERHUB_TOKEN }}

      - name: Extract metadata
        id: meta
        uses: docker/metadata-action@v4
        with:
          images: ${{ env.IMAGE_NAME }}
        env:
          DOCKER_METADATA_ANNOTATIONS_LEVELS: manifest,index

      - name: Build and push
        uses: docker/build-push-action@v5
        with:
          tags: ${{ steps.meta.outputs.tags }}
          annotations: ${{ steps.meta.outputs.annotations }}
          push: true