Revert "Remove defaults"

This reverts commit ecf8093.

Author: sue445

.github/workflows/release.yml

@@ -10,6 +10,11 @@ jobs:
     if: github.repository == 'ruby-go-gem/go-gem-wrapper'
     runs-on: ubuntu-latest
 
+    defaults:
+      run:
+        shell: bash
+        working-directory: _gem/
+
     environment:
       name: rubygems.org
       url: https://rubygems.org/gems/go_gem