Use setup-ruby to ensure Ruby is in the macOS PATH

Author: Eblo

.github/workflows/autobuild.yml

@@ -143,6 +143,10 @@ jobs:
         with:
           length: 7
 
+      - uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: '3.2'
+
       - name: Remove pre-existing homebrew packages
         run: brew remove --force $(brew list)