name: Build & Publish Docker Image

on:
  push:
    branches:
      - main
    tags:
      - "v*"

jobs:
  build-and-push:
    runs-on: ubuntu-24.04

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

      # Strip "https://" from the server URL to get the registry hostname
      - name: Resolve registry host
        id: reg
        run: |
          host=$(echo "${{ gitea.server_url }}" | sed 's|https://||;s|http://||;s|/||g')
          echo "host=$host" >> $GITEA_OUTPUT
          echo "image=$host/${{ gitea.repository }}" >> $GITEA_OUTPUT

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

      - name: Log in to Gitea registry
        uses: docker/login-action@v3
        with:
          registry: ${{ steps.reg.outputs.host }}
          username: ${{ secrets.REGISTRY_USER }}
          password: ${{ secrets.REGISTRY_TOKEN }}

      - name: Extract Docker metadata
        id: meta
        uses: docker/metadata-action@v5
        with:
          images: ${{ steps.reg.outputs.image }}
          tags: |
            type=raw,value=latest,enable=${{ gitea.ref == 'refs/heads/main' }}
            type=semver,pattern={{version}}
            type=semver,pattern={{major}}.{{minor}}
            type=sha,prefix=sha-,format=short

      - name: Build and push
        uses: docker/build-push-action@v6
        with:
          context: .
          push: true
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}
          cache-from: type=registry,ref=${{ steps.reg.outputs.image }}:cache
          cache-to: type=registry,ref=${{ steps.reg.outputs.image }}:cache,mode=max