auth-backend-module-github-provider: enable persisted scopes

Signed-off-by: Patrik Oldsberg <poldsberg@gmail.com>

.changeset/nice-dancers-explain.md

@@ -0,0 +1,5 @@
+---
+'@backstage/plugin-auth-backend-module-github-provider': patch
+---
+
+Fixed a bug where the GitHub authenticator did not properly persist granted OAuth scopes.

plugins/auth-backend-module-github-provider/src/authenticator.ts

@@ -28,6 +28,7 @@ const ACCESS_TOKEN_PREFIX = 'access-token.';
 export const githubAuthenticator = createOAuthAuthenticator({
   defaultProfileTransform:
     PassportOAuthAuthenticatorHelper.defaultProfileTransform,
+  shouldPersistScopes: true,
   initialize({ callbackUrl, config }) {
     const clientId = config.getString('clientId');
     const clientSecret = config.getString('clientSecret');