Prepends a directory so the runners PATH envvar in a way that make it
available in the following steps of the action. The PATH will not update
during this step.
octo_add_path(dir, check = TRUE)A directory. If relative will turned absolute using
base::getwd().
Should be checked that dir is an existing dir.
The octolog example workflow and the Github Docs.
if (FALSE) {
octo_addpath("/.local/bin")
}