WIP: Add missing package dependencies
This PR fixes a number of packaging faults by adding in missing build dependencies, mainly
pytest and related.
This also enables the python3 packages for
lalinference on both debian and RHEL.
This also modifies the CI to build RPM/Deb packages in empty containers, so that missing dependencies are easier to spot.
API Changes and Justification
Backwards Compatible Changes
- This change introduces no API changes
- This change adds new API calls
Backwards Incompatible Changes
- This change modifies an existing API
- This change removes an existing API
If any of the Backwards Incompatible check boxes are ticked please provide a justification why this change is necessary and why it needs to be done in a backwards incompatible way.
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