Add workflow to render PlantUML images

.github/workflows/render-puml.yaml

@@ -0,0 +1,20 @@
+---
+name: PlantUML Generation
+
+on:
+  push:
+    paths:
+      - '**.puml'
+  workflow_dispatch:
+
+jobs:
+  plantuml:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Generate PUML diagrams
+        uses: uclahs-cds/tool-PlantUML-action@v1.0.0
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          ghcr-username: ${{ github.actor }}
+          ghcr-password: ${{ secrets.GITHUB_TOKEN }}