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
For bigger setups, there is a Helm Chart here. This is documented here
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See SECURITY.md