add backend to pre merge action

Author: bhavabhuthi

.github/workflows/pre-merge.yml

@@ -15,10 +15,11 @@ env:
   END_SESSION_URL: ${{secrets.END_SESSION_URL}}
   REFRESH_TOKEN_URL: ${{secrets.REFRESH_TOKEN_URL}}
   NEXT_PUBLIC_BACKEND_URL: ${{secrets.NEXT_PUBLIC_BACKEND_URL_DS}}
+  BACKEND_URL: ${{secrets.BACKEND_URL}}
   BACKEND_GRAPHQL_URL: ${{secrets.BACKEND_GRAPHQL_URL_DS}}
   NEXT_PUBLIC_ENABLE_ACCESSMODEL: ${{secrets.NEXT_PUBLIC_ENABLE_ACCESSMODEL_DS}}
   NEXT_PUBLIC_BACKEND_GRAPHQL_URL: ${{secrets.NEXT_PUBLIC_BACKEND_GRAPHQL_URL_DS}}
-  
+
 jobs:
   build:
     runs-on: ubuntu-latest