add timeout

Now assertions enabled ruby binary doesn't run in 15 mins so it
tries to increase timeout to 30mins

Author: ko1

.github/workflows/ruby.yml

@@ -17,7 +17,7 @@ jobs:
   test:
 
     runs-on: ubuntu-latest
-    timeout-minutes: 15
+    timeout-minutes: 30
     strategy:
       fail-fast: false
       matrix: