Run Geti Tune container as non-root user

[leoll2]

The Geti Tune Docker image uses root as default user, which is not ideal from a security perspective.

A non-root user can be added to the Dockerfile as follows:

RUN useradd -m -u 10001 non-root && chown -R non-root:non-root /application
USER non-root

Try to add the non-root user and verify that everything still works correctly. Some adjustments may be necessary, e.g. change nginx to run on a non-privileged port. Privileges may be also needed to attach devices (e.g. cameras).