前言 之前写了一个开源项目，每次打tag的时候都要手动构建docker image然后上传实在是太麻烦了。于是研究了下GitHub Actions，发现非常好用。 本文就来讲一下，如何借助 Github Actions 自动构建兼容多 CPU 架构的 docker 镜像并发布到 DockerHub。
配置 使用build-push-action进行实现多CPU架构镜像构建。按照官方文档可以快速使用起来，但是有几个比较容易出错的地方需要注意。
配置案例 创建配置文件.github/workflows/docker-publish.yml
name: Docker # This workflow uses actions that are not certified by GitHub. # They are provided by a third-party and are governed by # separate terms of service, privacy policy, and support # documentation. on: push: # Publish semver tags as releases. tags: [ '**' ] env: # Use docker.io for Docker Hub if empty REGISTRY: 'docker.io' # github.repository as <account>/<repo> IMAGE_NAME: ${{ github.repository }} jobs: build: runs-on: ubuntu-latest permissions: contents: read packages: write # This is used to complete the identity challenge # with sigstore/fulcio when running outside of PRs. id-token: write steps: - name: Checkout repository uses: actions/checkout@v4 # Install the cosign tool except on PR # https://github.com/sigstore/cosign-installer - name: Install cosign uses: sigstore/[email protected] with: cosign-release: 'v2.4.0' # Set up BuildKit Docker container builder to be able to build # multi-platform images and export cache # https://github.com/docker/setup-buildx-action - name: Set up Docker Buildx uses: docker/setup-buildx-action@v3 # Login against a Docker registry except on PR # https://github.com/docker/login-action - name: Log into registry ${{ env.REGISTRY }} uses: docker/login-action@v3 with: registry: ${{ env.REGISTRY }} username: ${{ secrets.DOCKERHUB_USERNAME }} password: ${{ secrets.DOCKERHUB_TOKEN }} # Extract metadata (tags, labels) for Docker # https://github.com/docker/metadata-action - name: Extract Docker metadata id: meta uses: docker/metadata-action@v5 with: images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }} # Build and push Docker image with Buildx (don't push on PR) # https://github.com/docker/build-push-action - name: Build and push Docker image id: build-and-push uses: docker/build-push-action@v6 with: context: . platforms: linux/amd64,linux/arm64 push: true tags: ${{ steps.meta.outputs.tags }} labels: ${{ steps.meta.outputs.labels }} 很多配置见名知意，对照官方文档也都能找到答案。有的版本官方案例中使用很长一串具体版本，为了方便使用，我改为了数字版本。
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