Cache only in CI

apps/transport/client/webpack.prod.js

@@ -4,17 +4,23 @@ const CssMinimizerPlugin = require('css-minimizer-webpack-plugin')
 
 console.log('webpack production configuration is used 🚀')
 
-module.exports = merge(common, {
+const config = {
     mode: 'production',
-    cache: {
-        type: 'filesystem',
-        compression: 'gzip'
-    },
     optimization: {
         minimizer: [
             // For webpack@5 you can use the `...` syntax to extend existing minimizers (i.e. `terser-webpack-plugin`), uncomment the next line
             '...',
             new CssMinimizerPlugin()
         ]
     }
-})
+}
+
+// Enable caching only in the continuous integration env to speed-up builds
+if (process.env.CI === 'true') {
+    config.cache = {
+        type: 'filesystem',
+        compression: 'gzip'
+    }
+}
+
+module.exports = merge(common, config)