Update release workflow auth #979
Description
The release workflow is set up to use the default GITHUB_TOKEN. Because of this, release PRs to do not trigger any other workflows unless they are updated (for example, with an empty commit)
This is documented here: https://github.com/googleapis/release-please-action?tab=readme-ov-file#github-credentials
However, the suggested solution (personal access tokens) is not ideal as they are tied to a specific individual and require frequent rotation.
We should set up github app authentication to generate a token for release please.