name: build

on:
  workflow_dispatch:
  push:
    branches:
      - master
      - version-*
  # Run tests for any PRs
  pull_request:
  schedule:
    # Build the image regularly (each Friday)
    - cron: '23 04 * * 5'

env:
  REGISTRY: ghcr.io
  IMAGE_NAME: ${{ github.repository_owner }}/nextcloud

jobs:
  build:
    name: Build, push & sign
    runs-on: "ubuntu-latest"
    permissions:
      contents: read
      packages: write
      id-token: write

    steps:
      - name: Checkout code
        uses: actions/checkout@v2

      - name: Extract version for tags
        run: |
          BRANCH="${GITHUB_REF#refs/heads/}"
          VERSION=$(grep -oP '(?<=NEXTCLOUD_VERSION=).*' Dockerfile)
          [ "$BRANCH" = "master" ] && echo "BRANCH_VERSION=latest" >> $GITHUB_ENV
          echo "FULL_VERSION=${VERSION:0:7}" >> $GITHUB_ENV
          echo "MAJOR_VERSION=${VERSION:0:2}" >> $GITHUB_ENV

      - name: Install cosign
        if: github.event_name != 'pull_request'
        uses: sigstore/cosign-installer@main
        with:
          cosign-release: 'v2.2.2'

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v1

      - name: Login to registry
        if: github.event_name != 'pull_request'
        uses: docker/login-action@v1
        with:
          registry: ${{ env.REGISTRY }}
          username: ${{ github.repository_owner }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Set Docker metadata
        id: meta
        uses: docker/metadata-action@v3
        with:
          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
          tags: |
            ${{ env.BRANCH_VERSION }}
            ${{ env.FULL_VERSION }}
            ${{ env.MAJOR_VERSION }}

      - name: Build and push Docker image
        id: build-and-push
        uses: docker/build-push-action@v2
        with:
          context: .
          push: ${{ github.event_name != 'pull_request' }}
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}

      - name: Sign the published Docker image
        if: ${{ github.event_name != 'pull_request' }}
        env:
          COSIGN_EXPERIMENTAL: "true"
        run: cosign sign --yes ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}@${{ steps.build-and-push.outputs.digest }}