railwayapp 4.22.0

mutation ServiceCreate($name: String, $projectId: String!, $environmentId: String!, $source: ServiceSourceInput, $branch: String, $variables: EnvironmentVariables) {
  serviceCreate(
    input: {name: $name, projectId: $projectId, environmentId: $environmentId, source: $source, variables: $variables, branch: $branch}
  ) {
    id
    name
  }
}