👔 (oauth) add callback URI options

provides the option to define a callback URI following a request from the frontend; if not defined, it will
automatically use the backend's default URI.

src/modules/auth/providers/github.provider.ts

@@ -1,10 +1,11 @@
 import { GitHub } from "arctic";
 
-export const githubProvider = () => {
-  const redirectURI = `${process.env.APP_PROTOCOL}://${process.env.APP_DOMAIN}${process.env.GITHUB_CLIENT_CALLBACK}`;
+export const githubProvider = (
+  callbackURI = `${process.env.APP_PROTOCOL}://${process.env.APP_DOMAIN}${process.env.GITHUB_DEFAULT_CALLBACK}`
+) => {
   return new GitHub(
     process.env.GITHUB_CLIENT_ID!,
     process.env.GITHUB_CLIENT_SECRET!,
-    redirectURI
+    callbackURI
   );
 };