Make it easy / document how to run just one component of viash test

[scottgigante-immunai]

If I just ran viash test and it failed on test_generic_test/test_executable, I don't want to have to wait for it to rebuild the image (from cache, yes, but still takes time) and test method config -- I just want to rerun the test that last failed. Maybe there is a way to do this but it's not clear to me.

[rcannood]

You can run the tests associated with one Viash component with viash test path/to/config.vsh.yaml. At the moment, there isn't a way to run just one of the test scripts.

[scottgigante-immunai]

IMHO if you're not implementing a feature then the issue should be left open. This is something that at the very least I'd want to consider adding at a later date.