cache-build.yml

name: Docker Image Build with cache

on:
  push:
    branches:
      - main
  pull_request:
    branches: [ main ]

concurrency:
  group: ${{ github.workflow }}-${{ github.ref }}
  cancel-in-progress: true

jobs:
  cache_build:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v2

      - name: Prepare
        id: prep
        run: |
          TAG=$(echo "${GITHUB_SHA}" | head -c7)
          IMAGE="cndp"
          echo ::set-output "name=tagged_image::${IMAGE}:${TAG}"
          echo ::set-output "name=tag::${TAG}"

      - name: Set up Docker Buildx
        id: buildx
        uses: docker/setup-buildx-action@master

      # Registry login step intentionally missing

      - name: Cache Docker layers
        uses: actions/cache@v2
        with:
          path: /tmp/.buildx-cache
          key: ${{ runner.os }}-single-buildx-${{ github.sha }}
          restore-keys: |
            ${{ runner.os }}-single-buildx

      - name: Build production image
        uses: docker/build-push-action@v2
        with:
          context: .
          builder: ${{ steps.buildx.outputs.name }}
          file: ./containerization/docker/ubuntu/Dockerfile
          push: false # This would be set to true in a real world deployment scenario.
          tags: ${{ steps.prep.outputs.tagged_image }}
          cache-from: type=local,src=/tmp/.buildx-cache
          cache-to: type=local,dest=/tmp/.buildx-cache-new

        # Temp fix
        # https://github.com/docker/build-push-action/issues/252
        # https://github.com/moby/buildkit/issues/1896
      - name: Move cache
        run: |
          rm -rf /tmp/.buildx-cache && \
          mv /tmp/.buildx-cache-new /tmp/.buildx-cache