OBU OTA Server FQDN Fix

[Michael7371]

PR Details

Description

• Updates Dockerfile to use layer caching more efficiently by installing dependencies first
• Added logic to return firmware "href" download locations with a Fully Qualified Domain Name (FQDN) rather than emitting it
• Adding unit tests to verify logic changes

How Has This Been Tested?

Test deploy on CDOT K8 dev cluster and in WyDOT VM deployment. Added unit tests to validate logic.

Types of changes

• [ x ] Defect fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (fix or feature that cause existing functionality to change)

Checklist:

• [ x ] My changes require new environment variables:
  • [ x ] I have updated the docker-compose, K8s YAML, and all dependent deployment configuration files.
• My changes require updates to the documentation:
  • I have updated the documentation accordingly.
• [ x ] My changes require updates and/or additions to the unit tests:
  • [ x ] I have modified/added tests to cover my changes.
• [ x ] All existing tests pass.