Update xonsh-glibc-binary.Dockerfile

Update xonsh-glibc-binary.Dockerfile

Update nuitka command in Dockerfile

Removed the commented out no-deployment-flag option and added it to the nuitka command.

Update xonsh-glibc-binary.Dockerfile

Update xonsh-glibc-binary.Dockerfile

Update xonsh-glibc-binary.Dockerfile

Update xonsh-glibc-binary.Dockerfile

Upgrade base image from Ubuntu 18.04 to 20.04

Update xonsh-glibc-binary.Dockerfile

Update xonsh-glibc-binary.Dockerfile