An action that bumps the submodules in a repo.

Once you have installed it, you can trigger it with a /submodules comment on a PR.

Example workflow:

workflow "Bump Submodules" {
  on = "issue_comment"
  resolves = ["bump-submodules"]
}

action "bump-submodules" {
  uses = "domdere/git-submodule-action@master"
}

• Handle submodules referring to private repos (ssh?)