docker-image.yml

# GitHub Actions workflow for building and pushing Docker image to GitHub Container Registry
name: Build and Push Docker image

on:
  push:
    branches: [ main, master ]
  pull_request:
    branches: [ main, master ]

jobs:
  build:
    runs-on: ubuntu-latest
    permissions:
      contents: read
      packages: write

    steps:
      - name: Checkout repository
        uses: actions/checkout@v4

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v3

      - name: Log in to GitHub Container Registry
        uses: docker/login-action@v3
        with:
          registry: ghcr.io
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Set lower case owner name
        id: set_owner_lc
        run: echo "owner_lc=${OWNER,,}" >> $GITHUB_OUTPUT
        env:
          OWNER: ${{ github.repository_owner }}

      - name: Build and push Docker image
        uses: docker/build-push-action@v5
        with:
          context: .
          file: ./Dockerfile
          push: true
          tags: ghcr.io/${{ steps.set_owner_lc.outputs.owner_lc }}/jekyll-modified:latest