pack: only install extension in debug mode

src/main/index.dev.ts

@@ -0,0 +1,10 @@
+// Warning: This file is only used in the development environment
+// and is removed at build time.
+// Do not edit the file unless necessary.
+import { installExtension, VUEJS_DEVTOOLS } from 'electron-extension-installer'
+
+installExtension(VUEJS_DEVTOOLS, {
+  loadExtensionOptions: {
+    allowFileAccess: true
+  }
+})