github action for checking branch refs

[pcarney8]

Similar to WIP action, but warns people about the fact that their branch ref might need to change on their merge.

Even better would be to do the branch ref change on merge for people, but not sure that's possible

[garethahealy]

@pcarney8 ; not sure I understand the description. Are you saying:

Someone raises a PR and their branch is set as "my-change" and because it doesn't match the branch it's being merged into, i.e.: master, warn them?

or something else?

[garethahealy]

stale