expand GitHub Actions matrix (add Ubuntu, more JDKs) #9941
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on every merged PR, run the full 8/11/17 and Linux/Windows matrix (six entries)
we don't merge a huge quantity of PRs, so I think the cost/benefit here is probably good
it also constitutes progress on relying more on GitHub Actions and less on Travis-CI and Jenkins. for full context on that, see scala/scala-dev#751