Outpost functionality

Hi,
If one wishes to get Authentik to work with Traefik one should consider mounting /etc/ssl/certs/ca-certificates.crt READ-ONLY to container for Authentik to be able to access securely embedded outpost. Of combinations tried this seems to be only functional way to make combination work.

```
volumes:
  - /etc/ssl/certs/ca-certificates.crt:/etc/ssl/certs/ca-certificates.crt:ro


```
SH