Add config argument

[nwmcsween]

Untested, This allow specifying a config relative to the git repo and is useful for monorepo setups

[kzantow]

Hi @nwmcsween , sorry for the delay getting back to this -- I think we should name this parameter grype-config, and we need to add some basic tests for this, even if it's just verifying the grype command is invoked properly. I could probably help with this, would you be opposed to me pushing a commit to your branch for this?

[spiffcs]

@kzantow I can take a look here today and bring this across the finish line.

[spiffcs]

Todo:

• [ ] Update Docs
• [ ] Add Tests
• [ ] Change input parameter name