[enhancement] rdmo-app test environment

[jmfrenzel]

Descriptive summary

rdmo-app ships with a test environment 

Affects

Admins, Ops 

Rationale

Updates of  rdmo-catalog content; e.g. domain, catalogs, ...; and python dependencies may break an rdmo instance. 

Expected behavior

Test environment checks consistency of imported content.

Optional, fully featured test suite for ci/cd. 

Related work

Initial work contact @jmfrenzel

[jochenklar]

I think testing the catalog should be an external software product. The code is already tested with pytest and with pretty good coverage. No front-end tests though.

[jochenklar]

If we decide to include front-end tests we should have a look at https://playwright.dev