component_docker_build.yml

name: Build Docker Image

on:
  workflow_call:
    inputs:
      component:
        required: true
        type: string
    outputs:
      cache_key:
        description: "Docker Cache key"
        value: ${{ jobs.build_docker.outputs.cache_key }}
jobs:
  build_docker:
    runs-on: ubuntu-latest
    outputs:
      cache_key: ${{ steps.cache_key.outputs.cache_key }}
    steps:
      - name: Checkout
      - uses: actions/checkout@v4
        with:
          fetch-depth: "0"
      - id: load-docker-cache
        name: Load Docker Cache
        uses: actions/cache@v3
        with:
          path: /tmp/tmp/docker-images-${{ inputs.component }}
          key: /tmp/docker-images-${{ github.run_id }}-${{ inputs.component }}
          restore-keys: |
            /tmp/docker-images-
      - name: Set cache key output
        id: cache_key
        run: |
          echo ::set-output name=cache_key::/tmp/docker-images-${{ github.run_id }}
      - name: Prime docker cache
        run: (docker load -i /tmp/tmp/docker-images/snapshot-builder.tar || true) && (docker load -i /tmp/tmp/docker-images/snapshot.tar || true)
      - name: Build dockerfile
        env:
          # We are unable to leverage docker buildx here without changing the
          # caching mechanism significantly. See here for the caching options
          # available for docker buildx: https://docs.docker.com/engine/reference/commandline/buildx_build/#cache-from
          # For now at least enable DOCKER_BUILDKIT for faster builds. Eventually we
          # should rewrite this pipeline to use docker buildx with cache type=gha.
          DOCKER_BUILDKIT: "1"
        run: |
          docker build -t ${{ github.repository_owner }}/${{ inputs.component }}:builder --target builder --cache-from=${{ github.repository_owner }}/${{ inputs.component }}:builder --file Dockerfile.${{ inputs.component }} .
          docker build -t ${{ github.repository_owner }}/${{ inputs.component }}:latest --cache-from=${{ github.repository_owner }}/${{ inputs.component }}:builder --file Dockerfile.${{ inputs.component }} .

      - name: Tag and cache docker image
        run: |
          mkdir -p /tmp/tmp/docker-images-${{ inputs.component }} && docker save ${{ github.repository_owner }}/${{ inputs.component }}:builder -o /tmp/tmp/docker-images-${{ inputs.component }}/snapshot-builder-${{ inputs.component }}.tar && docker save ${{ github.repository_owner }}/${{ inputs.component }}:latest -o /tmp/tmp/docker-images-${{ inputs.component }}/snapshot-${{ inputs.component }}.tar