Update dockerfile

Preliminary changes to get the Docker build to work on my laptop.

Doesn't include intel realsense support at the moment.

Note that the dockerfile proposed works using the metalab package archive, which includes various forks of open sourced projects. We might want to reconsider the integration of dependencies in LivePose, considering we want to clean up a couple of repositories in our GitLab environment. Also, the metalab package archive is currently unsigned, which is why we need the --allow-unauthenticated flag for executing apt install