Update build.yml

add permissions to build.yml

Author: morozgrafix

.github/workflows/build.yml

@@ -6,7 +6,9 @@
 # For more information see: https://github.com/marketplace/actions/setup-ruby-jruby-and-truffleruby
 
 name: Ruby
-
+permissions:
+  contents: read
+  pull-requests: write
 on:
   push:
     branches: