We were baking AMI’s like this for a little while but our current setup is quite even fancier - you can do everything in containers and then a distributed in cluster buildkit cache and registry be hosted and backed by S3, and not only do you get a remote reusable cache that syncs extremely fast but you no longer have to rely on external artifact registries being flaky, which if you pull from Dockerhub frequently know this is an actual significant problem.

We actually looked at using this project from OP at the beginning of our ci journey but eventually decided on actions-runner-controller due to its higher level of robustness and configurabiltiy