Add basic, PrePush .overcommit.yml

Ash McKenzierequested to merge
ashmckenzie/overcommit-support into master

What does this Merge Request do?

This MR adds a .overcommit.yml file that is used by https://github.com/sds/overcommit. Currently it's configured to run a support/overcommit_pre_push (which just runs make test) prior to a git push.

Merge Request checklist

  • Tests added for new functionality. If not, please raise Issue to follow-up.
  • This change is backward compatible. If not, please include steps to communicate to our users.
  • Documentation added/updated, if needed.
  • gdk doctor test added, if needed.

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