hotfix: adding dynamic redirection in self-host auth system (HBE-173) (#40)

* chore: completed base auth implementation with redirectUrl

* chore: completed base auth fix with redirect_uri

* chore: added whitelist based redirection

* chore: added a env variable for session secret in main.ts

* chore: removed migrations folder from prisma directory

packages/hoppscotch-backend/src/auth/guards/github-sso.guard.ts

@@ -0,0 +1,15 @@
+import { ExecutionContext, Injectable } from '@nestjs/common';
+import { AuthGuard } from '@nestjs/passport';
+
+@Injectable()
+export class GithubSSOGuard extends AuthGuard('github') {
+  getAuthenticateOptions(context: ExecutionContext) {
+    const req = context.switchToHttp().getRequest();
+
+    return {
+      state: {
+        redirect_uri: req.query.redirect_uri,
+      },
+    };
+  }
+}