If you want an easy solution for GitHub Actions security, check out Garnet.ai (formerly listen.dev). They were built for GitHub first. And itβs free for single projects - https://dashboard.listen.dev/.
Yes, its a one step integration into your workflow file, typically before the steps you want to monitor eg. build, test if you don't want to see everything happening in your runner host. It has worked pretty well with ubuntu-latest and stock Linux runners from GH out of the box.