Add linter test for shell scripts

[alxiord]

Depends on rust-vmm/rust-vmm-container#30

[andreeaflorescu]

The container with shellcheck is now published.

For this we need to:

• find all bash files
• run shellcheck for them

This can be a test under integration_tests, and it needs to be running in the buildkite pipeline.

[nathanwhyte]

Hi Alexandra and Andreea,

I'm taking a Virtualization course at UT Austin and we've been asked to contribute to open-source virtualization repositories for one of our projects. Could I take a shot at resolving this issue?

[andreeaflorescu]

Hmmm, we don't have a lot of shell scripts, and this is not a main focus of the project. I am not sure this is the right problem to tackle. I would be inclined to just close it instead. @lauralt wdyt?