name: Build and Push Docker Image
on:
  push:
    branches:
      - main
jobs:
  build:
    runs-on: ubuntu-latest
    steps:
    - name: Checkout repository
      uses: actions/checkout@v2

    - name: Set up Docker Buildx
      uses: docker/setup-buildx-action@v2

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

    - name: Set up Docker login to GHCR
      uses: docker/login-action@v2
      with:
        registry: ghcr.io
        username: ${{ github.actor }}
        password: ${{ secrets.GITHUB_TOKEN }}

    - name: Generate docker tag
      id: prep
      run: |
        echo "REPO_NAME=$(echo '${{ github.repository_owner }}' | tr '[:upper:]' '[:lower:]')" >> $GITHUB_ENV
        echo "DATE_TAG=$(date +%s)" >> $GITHUB_ENV

    - name: Build Docker image
      run: docker build -f docker/Dockerfile . --tag ghcr.io/$REPO_NAME/ssh-project:$DATE_TAG

    - name: Push Docker image to GHCR
      run: docker push ghcr.io/$REPO_NAME/ssh-project:$DATE_TAG