Add tox job for swh-storage, which runs tests marked 'cassandra'.
These tests are disabled by default because they are too slow. This new job will run them in parallel of the non-cassandra tests.
This way, all commits/diffs will get non-cassandra failure messages early (if any), but also get the results of cassandra tests.
Depends on swh-jenkins-dockerfiles!13 (closed).
Test Plan
not tested
Migrated from D2571 (view on Phabricator)