Migrate to forgejo

.forgejo/workflows/docs.yml

@@ -0,0 +1,52 @@
+name: Publish documentation
+
+on:
+  push:
+    branches: [main]
+    paths:
+      - 'docs/**'
+      - 'great_ai/**'
+      - 'mkdocs.yaml'
+      - '.forgejo/workflows/docs.yml'
+  workflow_dispatch:
+
+concurrency:
+  group: pages
+  cancel-in-progress: false
+
+jobs:
+  publish:
+    runs-on: docker
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          # The mkdocs git-revision-date plugin reads each page's git history.
+          fetch-depth: 0
+
+      - name: Install uv
+        run: |
+          curl -LsSf https://astral.sh/uv/install.sh | sh
+          echo "$HOME/.local/bin" >> "$GITHUB_PATH"
+
+      - name: Set up Python
+        run: uv python install 3.10
+
+      - name: Install dependencies
+        run: |
+          uv venv --python 3.10
+          uv pip install '.[dev]'
+
+      - name: Build documentation
+        run: |
+          . .venv/bin/activate
+          mkdocs build
+
+      # The old workflow ran `mkdocs gh-deploy` (GitHub Pages); on this instance
+      # built sites are rsynced into the host /pages mount that nginx serves,
+      # via the shared ci-actions/deploy-pages action — same as photos/reconcile.
+      - name: Deploy to pages mount
+        if: github.ref == 'refs/heads/main'
+        uses: http://forgejo:3000/andras/ci-actions/deploy-pages@main
+        with:
+          source: site
+          target: great-ai