name: Build a docker image.

on:
  push:

jobs:
  build-docker-image:
    runs-on: nixos

    steps:
      - name: Check out repository code
        uses: actions/checkout@v4

      - name: Build image
        run: |
          nix build .#docker

      - name: Push image
        env:
          REGISTRY: "${{ gitea.server_url }}"
          REPOSITORY: "${{ gitea.repository }}"
          USERNAME: "${{ gitea.actor }}"
          PASSWORD: "${{ secrets.GITEA_TOKEN }}"
          TAG: "${{ gitea.sha }}"
        run: |
          REGISTRY="${REGISTRY#https://}"
          REGISTRY="${REGISTRY#http://}"
          REGISTRY="${REGISTRY%/}"

          IMAGE="${REGISTRY}/${REPOSITORY}:${TAG}"

          echo "Pushing ${IMAGE}"

          skopeo copy \
            --dest-creds "${USERNAME}:${PASSWORD}" \
            "docker-archive:result" \
            "docker://${IMAGE}"

          # Also update latest
          if [ "${GITEA_REF_TYPE}" = "branch" ] && [ "${GITEA_REF_NAME}" = "main" ]; then
            skopeo copy \
              --dest-creds "${USERNAME}:${PASSWORD}" \
              "docker-archive:result" \
              "docker://${REGISTRY}/${REPOSITORY}:latest"
          fi