🧐(CI) add dummy data to test-e2e job

To search some users we need to have some
dummy data in the database.
This commit adds dummy data to the database
like users, teams, and identities.

.github/workflows/people.yml

@@ -126,6 +126,10 @@ jobs:
         run: |
           make migrate
 
+      - name: Add dummy data
+        run: |
+          make demo FLUSH_ARGS='--no-input'
+
       - name: Setup Node.js
         uses: actions/setup-node@v4
         with: