improve docs generation

.github/workflows/superset-docs-deploy.yml

@@ -47,10 +47,12 @@ jobs:
           java-version: '21'
       - name: Install Graphviz
         run: sudo apt-get install -y graphviz
-      - name: Compute Entity Relationship diagram (ERD)
+      - name: Generate documentation artifacts
         env:
           SUPERSET_SECRET_KEY: not-a-secret
+          CI: true
         run: |
+          # Generate ERD
           python scripts/erd/erd.py
           curl -L http://sourceforge.net/projects/plantuml/files/1.2023.7/plantuml.1.2023.7.jar/download > ~/plantuml.jar
           java -jar ~/plantuml.jar -v -tsvg -r -o "${{ github.workspace }}/docs/static/img/" "${{ github.workspace }}/scripts/erd/erd.puml"