Add gitlab provider

backend/app/gitprovider/factory.go

@@ -19,6 +19,12 @@ func NewProvider(serverType, protocol, baseUrl, authToken string) (GitProvider,
 			baseUrl:   baseUrl,
 			authToken: authToken,
 		}, nil
+	case "gitlab":
+		return &GitLabProvider{
+			protocol:  protocol,
+			baseUrl:   baseUrl,
+			authToken: authToken,
+		}, nil
 	default:
 		return nil, fmt.Errorf("unsupported git provider: %s", serverType)
 	}