add gh action to monitor homebrew repo #26498
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This adds a github action to periodically or manually check the homebrew repo for updates they may have made to our chapel formula. Monitoring this allows us to keep the formula we test main against up to date with new changes the homebrew devs may make.
Currently this runs in a Jenkins job once per night, but just alerts us to the change and requires a user to create the PR. Doing it in a github action should allow the github bot to create the PR for us.
Future Work TODOs:
It might be nice to have another companion action that deletes branches created by this bot after they are merged.
We might want to notify some set of users if this action runs and finds an existing branch, as a reminder to merge the PR.