Add Actions 'bash test' and 'Windows JRuby' (gem install sassc) steps

.github/workflows/test.yml

@@ -85,6 +85,12 @@ jobs:
           else { echo "Can't find $e" }
           echo ''
         }
+    - name: bash test
+      shell: bash
+      run: echo ~
+    - name: Windows JRuby
+      if: startsWith(matrix.os, 'windows') && startsWith(matrix.ruby, 'jruby')
+      run: gem install sassc -N
 
   lint:
     runs-on: ubuntu-latest