go-bot

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name: Docker
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# This workflow uses actions that are not certified by GitHub.
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# They are provided by a third-party and are governed by
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# separate terms of service, privacy policy, and support
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# documentation.
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on:
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  workflow_dispatch:
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env:
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  # Use docker.io for Docker Hub if empty
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  REGISTRY: docker.io
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  # github.repository as <account>/<repo>
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  IMAGE_NAME: ${{ secrets.IMAGE_NAME }}
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jobs:
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  build:
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    runs-on: ubuntu-latest
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    permissions:
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      contents: read
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      packages: write
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      # This is used to complete the identity challenge
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      # with sigstore/fulcio when running outside of PRs.
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      id-token: write
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    steps:
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      - name: Checkout repository
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        uses: actions/checkout@v2
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      # Install the cosign tool except on PR
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      # https://github.com/sigstore/cosign-installer
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      - name: Install cosign
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        if: github.event_name != 'pull_request'
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        uses: sigstore/cosign-installer@1e95c1de343b5b0c23352d6417ee3e48d5bcd422
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        with:
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          cosign-release: 'v1.4.0'
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      # Workaround: https://github.com/docker/build-push-action/issues/461
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      - name: Setup Docker buildx
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        uses: docker/setup-buildx-action@79abd3f86f79a9d68a23c75a09a9a85889262adf
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      # Login against a Docker registry except on PR
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      # https://github.com/docker/login-action
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      - name: Log into registry ${{ env.REGISTRY }}
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        if: github.event_name != 'pull_request'
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        uses: docker/login-action@28218f9b04b4f3f62068d7b6ce6ca5b26e35336c
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        with:
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          registry: ${{ env.REGISTRY }}
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          username: ${{ secrets.DOCKER_HUB_USERNAME }}
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          password: ${{ secrets.DOCKER_HUB_TOKEN }}
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      # Extract metadata (tags, labels) for Docker
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      # https://github.com/docker/metadata-action
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      - name: Extract Docker metadata
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        id: meta
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        uses: docker/metadata-action@98669ae865ea3cffbcbaa878cf57c20bbf1c6c38
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        with:
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          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
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      # Build and push Docker image with Buildx (don't push on PR)
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      # https://github.com/docker/build-push-action
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      - name: Build and push Docker image
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        id: build-and-push
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        uses: docker/build-push-action@ad44023a93711e3deb337508980b4b5e9bcdc5dc
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        with:
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          context: .
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          push: ${{ github.event_name != 'pull_request' }}
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          tags: ${{ steps.meta.outputs.tags }}
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          labels: ${{ steps.meta.outputs.labels }}
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      # Sign the resulting Docker image digest except on PRs.
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      # This will only write to the public Rekor transparency log when the Docker
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      # repository is public to avoid leaking data.  If you would like to publish
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      # transparency data even for private images, pass --force to cosign below.
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      # https://github.com/sigstore/cosign
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      - name: Sign the published Docker image
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        if: ${{ github.event_name != 'pull_request' }}
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        env:
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          COSIGN_EXPERIMENTAL: "true"
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        # This step uses the identity token to provision an ephemeral certificate
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        # against the sigstore community Fulcio instance.
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        run: cosign sign ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}@${{ steps.build-and-push.outputs.digest }}
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