Source mods test was corrected to start from `supervisor` folder within repo and not include tests. The patch here was still starting from the workspace directory since that's what it used to do
* Using CAS for content-trust
* v2
* Fix linting errors
* Adjust field checked for status in CAS response
* CI workflow needs CAS not VCN now
* Use cwd in test as code won't be in /usr/src
* Pre-cache CAS pub key for supervisor
* Cas doesn't actually need key file executable
Co-authored-by: Mike Degatano <michael.degatano@gmail.com>
