POC: Start Pipewire Server completely within `engine-core` container, or as a daemon on the host

Currently we have no approach to start Pipewire as a service.

Therefore we want to try:

• (A): Run Pipewire as aura user: Check if it can be run as a daemon; try to start it with some systemd unit file.
• (B): Run Pipewire in a container only: We may look into the possibility to init & start Pipewire completely within the engine-core container. @kay_jointech shared this example and suggested to look into the layers. POC can be found in aura-contrib/pipewire-docker.

As part of this ticket @Loxbie and @kay_jointech will check for a Docker solution (B). If that does not work, we further investigate approach (A).