default Gemfile excluded until rack fix

Author: tansengming

.github/workflows/ruby.yml

@@ -16,7 +16,7 @@ jobs:
     strategy:
       matrix:
         ruby: [3.0.7, 3.1.6]
-        gemfile: [Gemfile, gemfiles/rails60.gemfile]
+        gemfile: [gemfiles/rails60.gemfile] # default Gemfile excluded until rack fix
     steps:
     - uses: actions/checkout@v1
     - name: Set up Ruby