Fix app installations endpoint

main.go

@@ -1932,7 +1932,7 @@ func (git *repoSync) RefreshGitHubAppToken(ctx context.Context, githubBaseURL, p
 		return err
 	}
 
-	url, err := url.JoinPath(githubBaseURL, fmt.Sprintf("installations/%d/access_tokens", installationID))
+	url, err := url.JoinPath(githubBaseURL, fmt.Sprintf("app/installations/%d/access_tokens", installationID))
 	if err != nil {
 		return err
 	}