name: Docker publish

# Builds the image and pushes it to a Gitea Container Registry.
#
# Configure the repository by adding these secrets / variables:
#   Secrets:
#     REGISTRY_TOKEN  - Gitea PAT with `write:package` (and `read:repository`) scope.
#   Variables (Settings -> Actions):
#     REGISTRY_HOST    - the Gitea registry host, e.g. gitea.com (default below)
#     REGISTRY_OWNER   - owner/namespace of the repo, e.g. your-username or your-org
#     REGISTRY_REPO    - repository name, e.g. balance-server
#     REGISTRY_USER    - the username owning the token if it differs from REGISTRY_OWNER.
#
# NOTE: variable/secret names must NOT start with GITEA_ or GITHUB_.

on:
  push:
    tags:
      - "v*.*.*"

env:
  REGISTRY_HOST: ${{ vars.REGISTRY_HOST || 'gitea.com' }}
  REGISTRY_OWNER: ${{ vars.REGISTRY_OWNER }}
  REGISTRY_REPO: ${{ vars.REGISTRY_REPO || github.event.repository.name }}
  REGISTRY_USER: ${{ vars.REGISTRY_USER || vars.REGISTRY_OWNER }}

jobs:
  publish:
    name: Build and push image
    runs-on: ubuntu-latest
    permissions:
      packages: write
      contents: read
    steps:
      - name: Checkout
        uses: actions/checkout@v4

      - name: Compute tags
        id: meta
        env:
          VERSION: ${{ github.ref_name }}
        run: |
          # Keep only semver body so "v1.2.3" -> "1.2.3".
          tag="${VERSION#v}"
          echo "version_tagname=$tag" >> "$GITHUB_OUTPUT"

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

      - name: Log in to Gitea Container Registry
        uses: docker/login-action@v3
        with:
          registry: ${{ env.REGISTRY_HOST }}
          username: ${{ env.REGISTRY_USER }}
          password: ${{ secrets.REGISTRY_TOKEN }}

      - name: Build and push
        uses: docker/build-push-action@v6
        with:
          context: .
          push: true
          tags: |
            ${{ env.REGISTRY_HOST }}/${{ env.REGISTRY_OWNER }}/${{ env.REGISTRY_REPO }}:${{ steps.meta.outputs.version_tagname }}
            ${{ env.REGISTRY_HOST }}/${{ env.REGISTRY_OWNER }}/${{ env.REGISTRY_REPO }}:latest
          cache-from: type=gha
          cache-to: type=gha,mode=max