Add additional supported rubies to main workflow

Author: martinemde

.github/workflows/main.yml

@@ -14,7 +14,9 @@ jobs:
     strategy:
       matrix:
         ruby:
-          - '3.4.2'
+          - '3.4'
+          - '3.3'
+          - '3.2'
 
     steps:
       - uses: actions/checkout@v4