build-and-push-image.yaml

name: Build and Push Image

on:
  workflow_call:
    outputs:
      branch:
        description: "The name of the branch"
        value: ${{ jobs.build-and-push.outputs.branch }}
      image:
        description: "The fully qualified built image"
        value: ${{ jobs.build-and-push.outputs.image }}
      tag:
        description: "The tag component of the image"
        value: ${{ jobs.build-and-push.outputs.tag }}

env:
  REGISTRY: ghcr.io

jobs:
  build-and-push:
    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
    outputs:
      branch: ${{ steps.branch-name.outputs.current_branch }}
      image: ${{ steps.image-tag.outputs.image }}
      tag: ${{ steps.image-tag.outputs.tag }}

    steps:
      - name: Checkout
        uses: actions/checkout@v3

      # github.repository as <account>/<repo>
      - name: Capture image name
        run: |
          echo "IMAGE_NAME=${GITHUB_REPOSITORY@L}" >>${GITHUB_ENV}

      - name: Get branch name
        id: branch-name
        uses: tj-actions/branch-names@v7

      # 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@f95db51fddba0c2d1ec667646a06c2ce06100226 # v3.0.0

      # Extract metadata (tags, labels) for Docker
      # https://github.com/docker/metadata-action
      - name: Extract Docker metadata
        id: meta
        uses: docker/metadata-action@96383f45573cb7f253c731d3b3ab81c87ef81934 # v5.0.0
        with:
          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}

      - name: Set image name and tag
        id: image-tag
        run: |
          tag="${{ steps.branch-name.outputs.current_branch }}.${{ github.run_id }}"
          echo "image=${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:$tag" >> $GITHUB_OUTPUT
          echo "tag=$tag" >> $GITHUB_OUTPUT

      - name: Login to GitHub Container Registry
        uses: docker/login-action@v3
        with:
          registry: ghcr.io
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      # Build and push Docker image with Buildx
      # https://github.com/docker/build-push-action
      - name: Build and push Docker image
        id: build-and-push
        uses: docker/build-push-action@0565240e2d4ab88bba5387d719585280857ece09 # v5.0.0
        with:
          context: .
          push: true
          tags: ${{ steps.image-tag.outputs.image }}
          labels: ${{ steps.meta.outputs.labels }}
          cache-from: type=gha
          cache-to: type=gha,mode=max