Test ruby 3.0 on Jenkins

[estolfo]

Issues with running test suite on ruby 3.0:

• google-protobuf cannot be install on ruby >= 2.8. The message is google-protobuf-3.14.0-universal-darwin requires ruby version < 2.8.dev, >= 2.3, which is incompatible with the current version, ruby 3.0.0p0

• The json validation spec is failing because the json-schema gem needs to update their use of Kernel#open to be URI.open instead here. Reference here. I've opened an issue with their repo here.

After this is merged, open an issue as a reminder to:

• When a grape version supporting ruby 3.0 is released, update the jenkins matrices to include that version
• When a json-schema version is released supporting ruby 3.0, possibly change the json_schema_matcher to pass a url to JSON::Valdiator.validate! again

[apmmachine]

💚 Build Succeeded

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Build stats

• Build Cause: Started by user Emily S

• Start Time: 2021-01-13T10:49:33.026+0000

• Duration: 20 min 44 sec

Test stats 🧪

Test	Results
Failed	0
Passed	51264
Skipped	93
Total	51357

Steps errors

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Shell Script

• Took 2 min 27 sec . View more details on here
• Description: [2021-01-13T10:57:03.467Z] + ./spec/scripts/spec.sh docker.elastic.co/observability-ci/jruby:9.2-11-

[mikker]

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