Setup Graphviz in GitHub Actions

Author: object-Object

.github/workflows/docs.yml

@@ -38,6 +38,8 @@ jobs:
 
       - uses: gradle/actions/setup-gradle@v4
 
+      - uses: ts-graphviz/setup-graphviz@v2
+
       - name: Sync dependencies
         run: uv sync --frozen --no-dev