authentik is an open-source Identity Provider focused on flexibility and versatility. You can use authentik in an existing environment to add support for new protocols. authentik is also a great solution for implementing signup/recovery/etc in your application, so you don't have to deal with it.
For small/test setups it is recommended to use docker-compose, see the [documentation](https://goauthentik.io/docs/installation/docker-compose/?utm_source=github)
For bigger setups, there is a Helm Chart [here](https://github.com/goauthentik/helm). This is documented [here](https://goauthentik.io/docs/installation/kubernetes/?utm_source=github)
