Make google CLA check ignore github actions bot

Probably not the right place for this, but not sure what other repo would be more appropriate. If you use github actions to create releases and do automatic version bumps, it fails the CLA check https://github.com/bazelbuild/apple_support/pull/145

Start by inspecting the CLA check configuration in this repository and the referenced bazelbuild/apple_support pull request 145. Reproduce the failure for a GitHub Actions bot performing an automatic release or version bump, then verify that the CLA check handles that actor without weakening checks for other contributors.

Written by the indexing model from the issue text.