publish.yml

name: Publish OCR-D Monitor

on:
  workflow_dispatch:
    inputs:
      checkout-ref:
        description: The branch, tag or SHA to checkout. Otherwise, uses the default branch.
      image-tag:
        description: Tag name of Docker image
        default: 'latest'

env:
  IMAGE_NAME: ghcr.io/${{ github.repository }}

jobs:
  build-deploy:
    runs-on: ubuntu-latest

    steps: 
    - name: Checkout without input reference (default)
      uses: actions/checkout@v3
      if: github.event.inputs.checkout-ref == ''
    
    - name: Checkout input reference ${{ github.event.inputs.checkout-ref }}
      uses: actions/checkout@v3
      if: github.event.inputs.checkout-ref != ''
      with:
        ref: ${{ github.event.inputs.checkout-ref }}
        
    - name: Determine environment variables
      run: |
        date -u +"build_date=%Y-%m-%dT%H:%M:%SZ" >> $GITHUB_ENV
        LOCAL_VSC_REF=`git rev-parse --short HEAD`
        echo "vcs_ref=$LOCAL_VSC_REF" >> $GITHUB_ENV
        echo "cache_key=${{ github.event.inputs.image-tag }}-$LOCAL_VSC_REF" >> $GITHUB_ENV # (input image-tag - vcs_ref)
        echo "$LOCAL_VSC_REF" > /tmp/${{ github.event.inputs.image-tag }}-vcs-ref # temporary file to fill cache
    
    - name: Get cache key "${{ env.cache_key }}"
      uses: actions/cache/restore@v3
      id: cache
      with:
        path: /tmp/${{ github.event.inputs.image-tag }}-vcs-ref
        key: ${{ env.cache_key }}
        lookup-only: true

    - # Activate cache export feature to reduce build time of images
      name: Set up Docker Buildx
      if: steps.cache.outputs.cache-hit != 'true'
      uses: docker/setup-buildx-action@v2

    - name: Login to GitHub Container Registry
      if: steps.cache.outputs.cache-hit != 'true'
      uses: docker/login-action@v2
      with:
        registry: ghcr.io
        username: ${{ github.actor }}
        password: ${{ secrets.GITHUB_TOKEN }}

    - name: Build the OCR-D Monitor image "${{ env.IMAGE_NAME }}:${{ github.event.inputs.image-tag }}" and deploy to GitHub Container Repository
      if: steps.cache.outputs.cache-hit != 'true'
      uses: docker/build-push-action@v4
      with:
        context: .
        push: true
        tags: ${{ env.IMAGE_NAME }}:${{ github.event.inputs.image-tag }}
        build-args: |
          BUILD_DATE=${{ env.build_date }}
          VCS_REF=${{ env.vcs_ref }}
        cache-from: type=gha
        cache-to: type=gha,mode=max
    
    - name: Save cache key "${{ env.cache_key }}" 
      uses: actions/cache/save@v3
      if: steps.cache.outputs.cache-hit != 'true'
      with:
        path: /tmp/${{ github.event.inputs.image-tag }}-vcs-ref
        key: ${{ env.cache_key }}