This GitHub Action automatically runs Lighthouse on Vercel preview deployments performed automatically by the Vercel GitHub app.
It's heavily inspired by Mike Nikles' tweet and OskarAhl's lighthouse-github-action-comment. I found that OskarAhl's solution wasn't automatically getting the Vercel deployment URL from my PRs, so I fixed that bit by using patrickedqvist/wait-for-vercel-preview.
No inputs. No setup required. Just install and you're good.