name: Build & push image

# Builds the gadfly-reports daemon image and pushes it to the Gitea container
# registry so it's easy to self-host.
#
#   push to main   -> :latest + :sha-<short>
#   push tag v*    -> :<tag> + :latest
#
# Required repo secrets: REGISTRY_USER / REGISTRY_PASSWORD (registry push). The
# Go build uses only PUBLIC modules, so no private-module creds are needed.

on:
  push:
    branches: [main]
    tags: ["v*"]
    paths-ignore:
      - "**.md"
      - "LICENSE"
      - ".gitignore"
      - ".env.example"
  workflow_dispatch: {}

concurrency:
  group: gadfly-reports-image-${{ github.ref }}
  cancel-in-progress: true

env:
  IMAGE_NAME: gitea.stevedudenhoeffer.com/steve/gadfly-reports

jobs:
  build-and-push:
    runs-on: ubuntu-latest
    timeout-minutes: 20
    steps:
      - uses: actions/checkout@v4

      - name: Set up Docker Buildx
        run: docker buildx create --use --name gr-builder --driver docker-container 2>/dev/null || docker buildx use gr-builder

      - name: Log in to the registry
        env:
          REGISTRY_USER: ${{ secrets.REGISTRY_USER }}
          REGISTRY_PASSWORD: ${{ secrets.REGISTRY_PASSWORD }}
        run: echo "${REGISTRY_PASSWORD}" | docker login gitea.stevedudenhoeffer.com -u "${REGISTRY_USER}" --password-stdin

      - name: Compute tags
        id: meta
        run: |
          SHA_SHORT=$(echo "${GITHUB_SHA}" | cut -c1-7)
          if [ "${{ github.ref_type }}" = "tag" ]; then
            TAGS="${IMAGE_NAME}:${GITHUB_REF_NAME},${IMAGE_NAME}:latest"
          else
            TAGS="${IMAGE_NAME}:latest,${IMAGE_NAME}:sha-${SHA_SHORT}"
          fi
          echo "tags=${TAGS}" >> "$GITHUB_OUTPUT"
          echo "Tags: ${TAGS}"

      - name: Build and push
        run: |
          TAG_FLAGS=""
          IFS=',' read -ra TAG_ARRAY <<< "${{ steps.meta.outputs.tags }}"
          for t in "${TAG_ARRAY[@]}"; do TAG_FLAGS="$TAG_FLAGS --tag $t"; done
          docker buildx build \
            --push \
            --platform linux/amd64 \
            $TAG_FLAGS \
            --add-host gitea.stevedudenhoeffer.com:192.168.0.134 \
            --file ./Dockerfile \
            .