added user service to Dockerfile so it run as non-root user

[brosano]

This adds the necessary modifications to the Dockerfile to ensure that the application runs as a non-root user. The changes include the creation of a non-privileged user, setting appropriate permissions, and adjusting the Dockerfile accordingly.

[meonkeys]

This maps to an arbitrary user id that may or may not exist on the Docker host, right? So if you want asr to, for example, cache models in mounted volumes (mounted to host folders), those folders on the host would need to be owned by the same user id and have proper permissions.