Allow setting of "redirect_uri"

[websocket98765]

sk-auth defaults to https://localhost:3000/api/auth/callback/github with no ability to change it successfully.

Note the s in https.

This is problematic because for localtesting where https isn't used.

[moreorover]

The protocol can be set when creating a SvelteKitAuth object.

export const appAuth: SvelteKitAuth = new SvelteKitAuth({ providers: [oauthProvider], protocol: 'http' });

[websocket98765]

Thank you! I did the following

import { dev } from '$app/env';

export const appAuth = new SvelteKitAuth({
  protocol: dev ? 'http' : 'https',
  providers: [
    // ...
  ],
  // ...
});