code: public MultiRuntimeConfigurationBuilder setSubmissionRuntime(final String runtimeName) {
      Validate.isTrue(
              SUPPORTED_SUBMISSION_RUNTIMES.contains(runtimeName), "Unsupported submission runtime " +
              runtimeName);
      Validate.isTrue(this.submissionRuntime == null, "Submission runtime was already added");
  
      this.submissionRuntime = runtimeName;
      return this;
    }
docs: Sets the submission runtime. Submission runtime is used for launching the job driver.
  @param runtimeName the submission runtime name
  @return The builder instance