go-git timing out creating tree

Question

I'm doing a similar implementation of this example https://github.com/google/go-github/blob/03b5525554d33bcc1a735ab509224599107227a9/example/commitpr/main.go

I'm running into this error

POST https://api.github.com/repos/XXX/XXX/git/trees: 502 Sorry, your request timed out.  It's likely that your input was too large to process.  Consider building the tree incrementally, or building the commits you need in a local clone of the repository and then pushing them to GitHub. []

The flow is as follows

• Check if the repo exists upstream if not create it
• Then loop through the file tree of a given folder path and add them to

func getTree(ref *github.Reference) (tree *github.Tree, err error) {
    // Create a tree with what to commit.
    entries := []*github.TreeEntry{}

    // Load each file into the tree.
    for _, fileArg := range buildFileTree() {
        file, content, err := getFileContent(fileArg)
        if err != nil {
            return nil, err
        }
        relativePath, _ := filepath.Rel(basePath, file)

        entries = append(entries, &github.TreeEntry{Path: github.String(relativePath), Type: github.String("blob"), Content: github.String(string(content)), Mode: github.String("100644")})
    }

    tree, _, err = client.Git.CreateTree(ctx, *sourceOwner.Login, *sourceRepo.Name, *ref.Object.SHA, entries)
    return tree, err
}

And this part is failing with the error stated above. This folder is 35MB in size Any idea on how to overcome this? Would it make a difference to build the tree locally and then push it?