this doesn't work for PRs from forks, since fork PRs don't have access to repo secrets.
we'll need some more advanced mechanism to avoid redundant reviews, but that's a job for another time.
Branch protection rules currently require 2 approving reviews to merge a PR. What we really want is for 2 team members to be aware of every change. If a team member makes a PR, only one other approval should be needed.
Since GitHub doesn't currently allow us to set different review thresholds for different users/teams, sending an automatic approval via GitHub Actions is the next best thing. This should reduce friction of team development work.
