ci: Enable verbose output for josh-sync

Author: tgross35

.github/workflows/rustc-pull.yml

@@ -7,6 +7,9 @@ on:
     # Run at 04:00 UTC every Monday and Thursday
     - cron: '0 4 * * 1,4'
 
+env:
+  JOSH_SYNC_VERBOSE: true
+
 jobs:
   pull:
     if: github.repository == 'rust-lang/compiler-builtins'