adds one of 3 labels to a approved commit

"12.approvals: 1"
"12.approvals: 2"
"12.approvals: 3+

https://github.com/NixOS/nixpkgs/labels?q=approvals+

set GITHUB_BOT_TOKEN or GITHUB_TOKEN to a github token with permissions to add labels

nix run

github doesn't have a way to show approvals made by non-committers.

i created this to give non-committers a way to help committers.