name: Image Docker

# Construit l'image à chaque mise à jour de main et la publie sur GHCR :
# le serveur la récupère au prochain `docker compose up -d` (pull_policy: always).
on:
  push:
    branches: [main]
  workflow_dispatch:

permissions:
  contents: read
  packages: write

concurrency:
  group: docker-publish
  cancel-in-progress: true

jobs:
  build:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4

      - uses: docker/setup-buildx-action@v3

      - uses: docker/login-action@v3
        with:
          registry: ghcr.io
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Nom de l'image (minuscules)
        id: image
        run: echo "name=ghcr.io/${GITHUB_REPOSITORY,,}" >> "$GITHUB_OUTPUT"

      - uses: docker/build-push-action@v6
        with:
          context: .
          push: true
          tags: |
            ${{ steps.image.outputs.name }}:latest
            ${{ steps.image.outputs.name }}:${{ github.sha }}
          cache-from: type=gha
          cache-to: type=gha,mode=max