✅ Run CI with JRuby and TruffleRuby, too

Using jruby-head to get unreleased parser bugfix.

Author: nevans

.github/workflows/test.yml

@@ -23,7 +23,11 @@ jobs:
         exclude:
           - { ruby: head, os: windows-latest }
         include:
-          - { ruby: head, os: windows-latest, experimental: true }
+          - { ruby: head,             os: windows-latest, experimental: true }
+          # - { ruby: jruby,            os: ubuntu-latest,  experimental: true }
+          - { ruby: jruby-head,       os: ubuntu-latest,  experimental: true }
+          - { ruby: truffleruby,      os: ubuntu-latest,  experimental: true }
+          # - { ruby: truffleruby-head, os: ubuntu-latest,  experimental: true }
     runs-on: ${{ matrix.os }}
     continue-on-error: ${{ matrix.experimental }}
     timeout-minutes: 15