code: public Builder toBuilder() {
      Builder builder =
          builder(getServices())
              .additionalArguments(getAdditionalArguments())
              .automaticRestart(automaticRestart)
              .defaultGcsBucketName(defaultGcsBucketName)
              .environment(getEnvironment())
              .host(host)
              .jvmFlags(getJvmFlags())
              .port(port)
              .projectId(projectId);
      return builder;
    }
docs: Returns a mutable builder initialized with the values of this runtime configuration.