✨ create oauth login

Create authentication with oAuth using a third-party vendor. Currently, only GitHub is available, but more will be added
in the future.

src/index.ts

@@ -4,7 +4,7 @@ validateEnv();
 const { Elysia } = await import("elysia");
 const { routes } = await import("./routes");
 
-const app = new Elysia().use(routes).listen(process.env.PORT || 3000);
+const app = new Elysia().use(routes).listen(process.env.APP_PORT || 3000);
 
 console.log(
   `🦊 Elysia is running at ${app.server?.hostname}:${app.server?.port}`