Fix quoting for RAILS_ENV in background server startup commands

Author: AbanoubGhadban

.github/workflows/pro-integration-tests.yml

@@ -207,7 +207,7 @@ jobs:
       - name: Run Rails server in background
         run: |
           cd spec/dummy
-          RAILS_ENV=test rails server &
+          RAILS_ENV="test" rails server &
 
       - name: Wait for Rails server to start
         run: |
@@ -392,7 +392,7 @@ jobs:
       - name: Run Rails server in background
         run: |
           cd spec/dummy
-          RAILS_ENV=test rails server &
+          RAILS_ENV="test" rails server &
 
       - name: Wait for Rails server to start
         run: |