Allow JRuby to fail.

Author: gkellogg

.github/workflows/ci.yml

@@ -15,7 +15,7 @@ jobs:
     runs-on: ubuntu-latest
     env:
       CI: true
-      ALLOW_FAILURES: ${{ endsWith(matrix.ruby, 'head') }}
+      ALLOW_FAILURES: ${{ endsWith(matrix.ruby, 'head') || matrix.ruby == 'jruby' }}
     strategy:
       fail-fast: false
       matrix: