build.yml

name: Build and Publish to Registry on Github push

env:
  GITHUB_SHA: ${{ github.sha }}
  REGISTRY_HOSTNAME: docker.io
  REPOSITORY: ${{ secrets.DOCKER_REPOSITORY }}

on: 
  - push
  - workflow_dispatch

jobs:
  setup-build-publish-deploy:
    name: Setup, Build, and Publish
    runs-on: ubuntu-latest
    steps:
      - name: Checkout
        uses: actions/checkout@v2
      
      - name: Prepare
        id: prep
        run: |
          TAG=$(echo $GITHUB_SHA | head -c7)
          IMAGE="${REPOSITORY}/hs_discover"
          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@v3

      - name: Docker Hub Login
        uses: docker/login-action@v3
        with:
          username: ${{ secrets.DOCKER_USER }}
          password: ${{ secrets.DOCKER_PASSWORD }}

      - 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
        uses: docker/build-push-action@v5
        with:
          context: .
          push: true
          tags: ${{ steps.prep.outputs.tagged_image }}
          cache-from: type=gha
          cache-to: type=gha,mode=max