Add bogus task to ensure backend deps are installed.

Author: dokterbob

apps/backend/moon.yml

@@ -37,3 +37,6 @@ tasks:
     preset: "server"
     deps:
       - build
+  # Bogus task to ensure deps are installed
+  setup:
+    command: "true"

apps/frontend/moon.yml

@@ -97,3 +97,4 @@ tasks:
     deps:
       - build
       - install-playwright
+      - backend:setup