fix: infinite refreshing when host at subpath

Close: #751

src/swRegistration.ts

@@ -23,7 +23,7 @@ export function register(config?: Config) {
     }
 
     window.addEventListener('load', () => {
-      const swUrl = `./sw.js`;
+      const swUrl = new URL('sw.js', publicUrl.href).href;
 
       if (isLocalhost) {
         // This is running on localhost. Let's check if a service worker still exists or not.