Correctly resolve nexus_url from environment variables (!104) · Merge requests · SKAO / SKA Telescope Model

Check CAR_TMDATA_REPOSITORY_URL before CAR_RAW_REPOSITORY_URL
If CAR_RAW_REPOSITORY_URL is used, replace internal with telmodel like what is done in ska-cicd-makefile .make-tmdata-support
Add explicit test of nexus returning 404 to get 100% coverage as that was implicitly tested previously by the CI CAR_RAW_REPOSITORY_URL not being correctly tweaked to replace internal with telmodel

Correctly resolve nexus_url from environment variables