.github/workflows/test.yml in grape-app-0.9.0 vs .github/workflows/test.yml in grape-app-0.10.0

@@ -10,9 +10,12 @@
   test:
     runs-on: ubuntu-latest
     strategy:
       matrix:
         ruby-version: ["2.7", "3.0", "3.1"]
+        gemfiles: ["Gemfile", "Gemfile.rails6"]
+    env:
+      BUNDLE_GEMFILE: ${{ matrix.gemfile }}
     steps:
       - uses: actions/checkout@v2
       - uses: ruby/setup-ruby@v1
         with:
           ruby-version: ${{ matrix.ruby-version }}