getTree generates the tree to commit based on the given files and the commit of the ref you got in getRef.

createCommit creates the commit in the given reference using the given tree.

BasicAuthTransport is an http.RoundTripper that authenticates all requests using HTTP Basic Authentication with the provided username and password.

RepositoryContent represents a file or directory in a github repository.

RepositoryContentFileOptions specifies optional parameters for CreateFile, UpdateFile, and DeleteFile.

RepositoryContentGetOptions represents an optional ref parameter, which can be a SHA, branch, or tag.