GitHub sign-in is not configured on this server.
Set GITHUB_OAUTH_CLIENT_ID and GITHUB_OAUTH_CLIENT_SECRET to the OAuth credentials of the Kintsua GitHub App and restart. The App's callback URL must be {{ redirect_uri }}.
No App yet? Create it in one click from the manifest; the result page prints every variable to copy into .env.
A session is scoped to the GitHub App installations you can see. Kintsua asks for no org-member or email scopes.