Improve docs pipeline with generated topology diagrams

.github/workflows/publish-docs.yml

@@ -28,13 +28,26 @@ jobs:
           test -d docs/public
           test -n "$(find docs/public -mindepth 1 -print -quit)"
 
+      - name: Install Graphviz
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y graphviz
+          dot -V
+
+      - name: Validate sanitized diagram artifacts
+        run: |
+          test -f docs/public/physical-topology.svg
+          test -f docs/public/docker-traefik-dynu.svg
+          ! rg -n "Graphviz dot not found" docs/public/*.svg
+          ! rg -n "lan\.ddnsgeek\.com" docs/public/*.svg docs/public/*.md
+          ! rg -n -i "password|token|api_key|secret" docs/public/*.svg
+
       - name: Install MkDocs
         run: |
           python3 -m pip install --user mkdocs
 
       - name: Build public MkDocs site
         run: |
-
           python3 -m mkdocs build -f mkdocs-public.yml --strict
 
       - name: Verify published content excludes internal/generated docs