Supporting a custom CSS

[ifeulner]

Hi, would be great if a custom css will be supported by the role.

Therefore a custom.css needs to be copied to the server and an additional volume mount is needed (eg. ./my-css-file.css:/web/dist/custom.css), see https://goauthentik.io/docs/interfaces/user/customization

Or is there any other way to allow this currently?

Thanks!

[ayushin]

done, together with an example in the README