main.yml

name: Build nightly
on:
  schedule:
    - cron: "0 0 * * *"

jobs:
  check:
    runs-on: 'ubuntu-latest'
    steps:
    - uses: octokit/request-action@v2.x
      id: check_last_run
      with:
        route: GET /repos/${{github.repository}}/actions/workflows/main.yml/runs?per_page=1&status=completed
      env:
        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

    - run: "echo Last daily build: ${{ fromJson(steps.check_last_run.outputs.data).workflow_runs[0].head_sha }}"

    outputs:
      last_sha: ${{ fromJson(steps.check_last_run.outputs.data).workflow_runs[0].head_sha }}

  build:
    runs-on: ubuntu-latest  
    needs: [check]
    if: needs.check.outputs.last_sha != github.sha
    
    steps:
    - name: Checkout
      uses: actions/checkout@v4
      with:
        submodules: true

    - name: Login to Github Container Registry
      uses: docker/login-action@v2
      with:
        registry: ghcr.io
        username: ${{ github.actor }}
        password: ${{ secrets.GITHUB_TOKEN }}

    - name: Build and push tagged Docker image
      uses: docker/build-push-action@v3
      with:
        context: .
        push: true
        tags: |
          ghcr.io/${{ github.repository_owner }}/vrep:latest