don't append key file if asked not to (#13368)

models/ssh_key.go

@@ -362,7 +362,7 @@ func CheckPublicKeyString(content string) (_ string, err error) {
 // appendAuthorizedKeysToFile appends new SSH keys' content to authorized_keys file.
 func appendAuthorizedKeysToFile(keys ...*PublicKey) error {
 	// Don't need to rewrite this file if builtin SSH server is enabled.
-	if setting.SSH.StartBuiltinServer {
+	if setting.SSH.StartBuiltinServer || !setting.SSH.CreateAuthorizedKeysFile {
 		return nil
 	}