docker.yml

name: Build Arch Dev Image

on:
  push:
    paths:
      - 'Dockerfile'

jobs:
  build:
    runs-on: ubuntu-latest

    permissions:
      contents: read
      packages: write

    steps:
      - uses: actions/checkout@v4

      - name: Check for Dockerfile changes
        id: changes
        run: |
          if git diff --name-only ${{ github.event.before }} ${{ github.sha }} | grep -q Dockerfile; then
            echo "changed=true" >> $GITHUB_OUTPUT
          else
            echo "changed=false" >> $GITHUB_OUTPUT
          fi

      - name: Set lowercase owner
        run: echo "OWNER=${GITHUB_REPOSITORY_OWNER,,}" >> $GITHUB_ENV

      - name: Login to GHCR
        run: echo "${{ secrets.GITHUB_TOKEN }}" | docker login ghcr.io -u ${{ github.actor }} --password-stdin

      - name: Build
        if: steps.changes.outputs.changed == 'true'
        run: docker build -t ghcr.io/${OWNER}/arch-dev:latest .

      - name: Push
        if: steps.changes.outputs.changed == 'true'
        run: docker push ghcr.io/${OWNER}/arch-dev:latest