Officially support Scylla

[FlorianHockmann]

We basically already support running JanusGraph with Scylla but we don't communicate that anywhere. I suggest that we add Scylla to our test suite running with GitHub actions and then add it to the list of tested projects in our changelog and in the release notes. Afterwards we could add a small section to the docs explaining how to use Scylla with the CQL backend.

• [x] Test Scylla automatically with GitHub actions #2351
• [x] Fix Hadoop integration tests for Scylla #2505
• [x] Document tested versions in changelog and release notes
• [x] Document how to use Scylla with the CQL backend (fixed in #3058)
• [ ] Fix SSL integration tests for Scylla #3595
• [ ] Add possibility to switch between scylla and cql dependencies in JanusGraph Server #3580

[porunov]

Also, it would be good to add this feature (which is partially related): https://github.com/JanusGraph/janusgraph/issues/1778

[farodin91]

There is already a PR https://github.com/JanusGraph/janusgraph/pull/2352 for testing.

[FlorianHockmann]

I think #1778 is going a step further already. I would like to keep this issue quite simple so that we basically just document how Scylla can already be used with JanusGraph.

There is already a PR #2352 for testing.

Nice to see! Then we really only have to change the docs here.

[li-boxuan]

https://github.com/JanusGraph/janusgraph/pull/2352 is merged with https://github.com/JanusGraph/janusgraph/issues/2505 left as TODO.

[FlorianHockmann]

#2352 is merged with #2505 left as TODO.

Thanks, I added #2505 as a TODO to the description.

[FlorianHockmann]

Just realized that the docs part is also already done: #3058