build.yml

# Controls when the workflow will run
on:
  # Triggers the workflow on push or pull request events but only for the master branch
  push:
    branches:
      - main
    # Publish semver tags as releases.
    tags: ["v*.*.*"]

  # Allows you to run this workflow manually from the Actions tab
  workflow_dispatch:

env:
  # Use docker.io for Docker Hub if empty
  REGISTRY: ${{ secrets.REGISTRY }}
  SECONDARY_REGISTRY: ${{ secrets.SECONDARY_REGISTRY }}
  # github.repository as <account>/<repo>
  IMAGE_NAME: ${{ github.repository }}

# A workflow run is made up of one or more jobs that can run sequentially or in parallel
jobs:
  # This workflow contains a single job called "build"
  build:
    # The type of runner that the job will run on
    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 represent a sequence of tasks that will be executed as part of the job
    steps:
      # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
      - uses: actions/checkout@v2

      # Set up golang environment
      # https://github.com/actions/setup-go
      - uses: actions/setup-go@v2
        with:
          go-version: "1.18"

      # Cache go modules for faster builds
      # https://github.com/actions/cache/blob/main/examples.md#go---modules
      - uses: actions/cache@v2
        with:
          path: |
            ~/.cache/go-build
            ~/go/pkg/mod
          key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
          restore-keys: ${{ runner.os }}-go-

      # Build binary
      - run: make build

      # Workaround: https://github.com/docker/build-push-action/issues/461
      - name: Setup Docker buildx
        uses: docker/setup-buildx-action@v1
        id: buildx

      # Login against a Docker registry except on PR
      # https://github.com/docker/login-action
      - name: Log into registry ${{ env.REGISTRY }}
        if: github.event_name != 'pull_request'
        uses: docker/login-action@v1
        with:
          registry: ${{ env.REGISTRY }}
          username: ${{ secrets.REGISTRY_USERNAME }}
          password: ${{ secrets.REGISTRY_PASSWORD }}

      # Login against another registry except on PR
      # https://github.com/docker/login-action
      - name: Log into registry ${{ env.REGISTRY }}
        if: github.event_name != 'pull_request'
        uses: docker/login-action@v1
        with:
          registry: ${{ env.SECONDARY_REGISTRY }}
          username: ${{ secrets.SECONDARY_REGISTRY_USERNAME }}
          password: ${{ secrets.SECONDARY_REGISTRY_PASSWORD }}

      # Extract metadata (tags, labels) for Docker
      # https://github.com/docker/metadata-action
      - name: Extract Docker metadata
        id: meta
        uses: docker/metadata-action@v3.6.2
        with:
          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }},${{ env.SECONDARY_REGISTRY }}/${{ 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@v2.9.0
        with:
          context: .
          push: ${{ github.event_name != 'pull_request' }}
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}