query LastCommit($owner: String!, $repo: String!,  $branch: String!, $path: String) {
  repository(owner: $owner, name: $repo) {
    ref(qualifiedName: $branch) {
      target {
        ... on Commit {
          history(first: 1, path: $path) {
            nodes {
              oid
              messageHeadline
            }
          }
        }
      }
    }
  }
}