Fix Ruby 2.2 setup in github action #101
Merged
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When the tests start to run, the Ruby 2.2 tests have a bug that makes it fail and that produces a cancellation of all the other jobs in that matrix.
Seems to be a known issue and this PR adds the proposed workaround from this bug report ruby/setup-ruby#496 (comment) running 2.2 and older in a previous version of Ubuntu instead of Ubuntu latest
You can see in the other 2 latest PRs that it was failing for 2.2 always, and I ran all the versions manually for #100 and 2.2 keeps failing