ci: add architecture docs generation on master push

.gitea/workflows/docs.yml

@@ -0,0 +1,49 @@
+name: Architecture Docs
+
+on:
+  push:
+    branches: [master]
+
+env:
+  CARGO_TERM_COLOR: always
+
+jobs:
+  generate:
+    name: Generate diagrams
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Install Rust stable
+        uses: dtolnay/rust-toolchain@stable
+
+      - name: Cache cargo
+        uses: actions/cache@v4
+        with:
+          path: |
+            ~/.cargo/registry
+            ~/.cargo/git
+            target
+          key: ${{ runner.os }}-cargo-${{ hashFiles('**/Cargo.lock') }}
+          restore-keys: ${{ runner.os }}-cargo-
+
+      - name: Build
+        run: cargo build --release
+
+      - name: Generate project diagram
+        run: ./target/release/archlens . --level project --output docs/architecture/project.mmd
+
+      - name: Generate module diagram
+        run: ./target/release/archlens . --level module --output docs/architecture/module.mmd
+
+      - name: Generate type diagrams (split)
+        run: ./target/release/archlens . --level type --split-by-module --output docs/architecture/type/
+
+      - name: Commit if changed
+        run: |
+          git config user.name "Archlens Bot"
+          git config user.email "archlens@noreply"
+          git add docs/architecture/
+          git diff --staged --quiet || git commit -m "docs: update architecture diagrams"
+          git push || true