fix env var loading

app/webpack.main.config.ts

@@ -1,6 +1,7 @@
 import type { Configuration } from 'webpack'
 
 import { rules } from './webpack.rules'
+import { plugins } from './webpack.plugins'
 
 export const mainConfig: Configuration = {
   /**
@@ -12,6 +13,7 @@ export const mainConfig: Configuration = {
   module: {
     rules,
   },
+  plugins,
   resolve: {
     extensions: ['.js', '.ts', '.jsx', '.tsx', '.css', '.json'],
   },