Make google CLA check ignore github actions bot

[keith]

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 bazelbuild/apple_support#145

[cameron-martin]

This is causing problems for vscode-bazel too. See bazel-contrib/vscode-bazel#360. I think we either need to get access to credentials for the @bazel-io bot or have the GitHub actions account not fail the CLA.

[meteorcloudy]

Google's internal policy says: "We will not grant the github-actions account CLA permission because it's a security risk." However, I don't think I can share credentials of bazel-io with non-googlers. There is a process to get an external bot CLA approval if Google deems it to be safe.