docker-serveo-server

https://serveo.net is an alternative for ngrok. taichunmin/serveo-server can let you host your own serveo. And taichunmin/serveo can let you secure URL to your localhost server through any NAT or firewall in Docker. Maintained by taichunmin on GitHub, where it has earned 81 stars from the community.

It's actively developed around alpine, docker, docker-compose, and is a solid reference for anyone building with these tools.