Have you had a look at Authentik? It might fit your needs.
Docker entryscripts sometimes have significant magic baked in (alas), but quite often Docker is a distribution mechanism more than anything else. The Docker guides are - 9 times out of 10 - more than informative enough to show how to DIY in any other of the dozens if not hundreds of other system types you might have.
If you want to resist using the easy thing, I personally think it behooves you to not bounce so quick. You don't have to use it, and it's good nearly universal documentation as to how to operate the thing.
Easy != Simple. Not everyone wants to play around with Dockerfiles, docker compose and what not. Sometimes a plain binary is preferred. I say this as someone who likes docker for certain use cases but docker is not my solution for everything.
Apt rules!
https://github.com/eriksjolund/podman-networking-docs https://github.com/eriksjolund/podman-nginx-socket-activatio... https://github.com/eriksjolund/socket-activate-httpd https://github.com/eriksjolund/mariadb-podman-socket-activat... https://github.com/PhracturedBlue/podman-socket-activated-se...