name: Build and deploy Backend

on:
  push:
    branches:
      - main

jobs:
  build:
    runs-on: build-host
    env:
      SERVICE_NAME: backend
      IMAGE_SHA: gitea.dsrptlab.com/mapflow/backend:${{ github.sha }}
      IMAGE_LATEST: gitea.dsrptlab.com/mapflow/backend:latest
    steps:
      - uses: actions/checkout@v4

      - name: Configure Gitea registry auth
        run: |
          set -euo pipefail
          mkdir -p ~/.docker
          auth="$(printf '%s:%s' "${{ secrets.REGISTRY_USERNAME }}" "${{ secrets.REGISTRY_TOKEN }}" | base64 | tr -d '\n')"
          printf '{"auths":{"gitea.dsrptlab.com":{"auth":"%s"}}}\n' "$auth" > ~/.docker/config.json

      - name: Build and push image
        run: |
          set -euo pipefail
          builder="builder"
          if ! docker buildx inspect "$builder" >/dev/null 2>&1; then
            docker buildx create --name "$builder" --driver docker-container --buildkitd-config /etc/buildkit/buildkitd.toml
          fi
          docker buildx use "$builder"
          docker buildx inspect --bootstrap
          docker buildx build --push --provenance=false --tag "$IMAGE_SHA" --tag "$IMAGE_LATEST" .

      - name: Prune shared BuildKit cache
        run: |
          set -euo pipefail
          docker buildx prune --builder builder --all --max-used-space 40gb -f