Action for rendering plantuml images on PR

.github/workflows/render_diagrams.yml

@@ -0,0 +1,31 @@
+name: Render Diagrams
+
+on:
+  pull_request:
+    branches:
+      - main
+
+    paths:
+      - "docs/*.puml"
+
+jobs:
+  render_diagrams:
+    runs-on: ubuntu-latest
+    permissions:
+      # Give the default GITHUB_TOKEN write permission to commit and push the changed files back to the repository.
+      contents: write
+    steps:
+      - name: Checkout GitHub Action
+        uses: actions/checkout@v4
+        with:
+          ref: ${{ github.head_ref }}
+
+      - name: Render PlantUML Diagrams
+        run: |
+          pushd docs
+          docker run --rm -v $(pwd):/data dstockhammer/plantuml -tpng -o ./images .
+          popd
+
+      - uses: stefanzweifel/git-auto-commit-action@v5
+        with:
+          commit_message: Render PlantUML diagrams