name: Deploy MkDocs to VPS

on:
  push:
    branches: [main]
  workflow_dispatch:

concurrency:
  group: site-production
  cancel-in-progress: false

jobs:
  deploy:
    runs-on: de-roadmap-host
    timeout-minutes: 15

    steps:
      - name: Check out the triggering commit
        env:
          COMMIT_SHA: ${{ gitea.sha }}
          REPOSITORY_URL: ${{ gitea.server_url }}/${{ gitea.repository }}.git
        run: |
          set -euo pipefail
          [[ "$COMMIT_SHA" =~ ^[0-9a-f]{40}$ ]]
          test ! -e source
          mkdir source
          git -C source init .
          git -C source remote add origin "$REPOSITORY_URL"
          git -C source fetch --no-tags --depth=1 origin "$COMMIT_SHA"
          test "$(git -C source rev-parse FETCH_HEAD)" = "$COMMIT_SHA"
          git -C source -c advice.detachedHead=false checkout --detach FETCH_HEAD

      - name: Build the site strictly
        run: source/.gitea/scripts/build-site.sh source

      - name: Publish the complete release atomically
        env:
          RELEASE_ID: ${{ gitea.sha }}-${{ gitea.run_id }}
        run: source/.gitea/scripts/deploy-site.sh source/site "$RELEASE_ID"