check for multiple java versions

Author: muhammadn

.github/workflows/main.yml

@@ -19,7 +19,7 @@ jobs:
         # Indexes for parallel jobs (starting from zero).
         # E.g. use [0, 1] for 2 parallel jobs, [0, 1, 2] for 3 parallel jobs, etc.
         #ci_node_index: [0, 1, 2, 3, 4, 5, 6, 7]
-        ruby-version: ['2.7', '3.0', '3.1']
+        java-version: ['11', '17', '21']
 
     env:
       TZ: "Europe/Ireland"