literally the most useful thing i've built to date. (alongside a general purpose auth proxy with art help from @wuilly)
i accidently learned docker engine api, redis and networking and made a self-hosted replit
it's a redis/nodejs docker compose app that exposes a tiny webserver. then on any nginx config i add an auth_proxy directive and it adds a login page to that site.
you can see a demo at store.wasteof.money (but i suppose you canโt actually login)