Work around CI failures coming from Launchable

https://github.com/ruby/ruby/actions/runs/15640729145/job/44067161266

Author: k0kubun

.github/actions/setup/directories/action.yml

@@ -183,3 +183,5 @@ runs:
           ${{ steps.clean.outputs.distclean }}
           ${{ steps.clean.outputs.remained-files }}
           ${{ steps.clean.outputs.final }}
+      # rmdir randomly fails due to launchable files
+      continue-on-error: true