Command to Download Default Dependencies Container

[Boogie3D]

Rather than simply attempting to point users toward a usable BEE dependencies container, there could be a client command to download the container from DockerHub, etc using Charliecloud's ch-image pull command. We should decide whether we want to pull this into Charliecloud's local image repo and keep it there or convert it into a tarball and store on the filesystem. This method may not be usable on restricted networks, but those circumstances can be handled on a case-by-case basis by providing the appropriate environment on those machines.

Possible commands are:

• beeclient pull
• beeclient pull-deps
• beeclient download-deps [dest_dir] (default: .)
• beeclient dependencies

[pagrubel]

Could we have a github action that builds the container and push it to dockerhub. We would run this manually.

[pagrubel]

Addressed in PR #728