Merge pull request #169 from CS3219-AY2425S1/fix/update-turn-env

update env for turn

Author: Kurtyjlee

cloudbuilds/fe.yaml

@@ -19,7 +19,7 @@ steps:
         "--build-arg",
         "NEXT_PUBLIC_TURN_SERVER=${_NEXT_PUBLIC_TURN_SERVER}",
         "--build-arg",
-        "NEXT_PUBLIC_TURN_USERNAME={_NEXT_PUBLIC_TURN_USERNAME}",
+        "NEXT_PUBLIC_TURN_USERNAME=${_NEXT_PUBLIC_TURN_USERNAME}",
         "--build-arg",
         "NEXT_PUBLIC_TURN_PASSWORD=${_NEXT_PUBLIC_TURN_PASSWORD}",
         "-f",