fix: added .env to assets

gmus-mobile/.env.example

@@ -1,2 +1,2 @@
 DART_ENV=development
-API_URL=https://10.0.2.2:3003
+API_URL=10.0.2.2:3003

gmus-mobile/pubspec.yaml

@@ -44,6 +44,7 @@ flutter:
 
   assets:
     - assets/icon/icon.png
+    - .env
 
   # An image asset can refer to one or more resolution-specific "variants", see
   # https://flutter.dev/assets-and-images/#resolution-aware.