Mark ruby head + rails main as experimental in matrix

Author: Spone

.github/workflows/ci.yml

@@ -43,6 +43,8 @@ jobs:
             rails_version: "8.1"
           - ruby_version: "head"
             rails_version: "main"
+            experimental: true
+    continue-on-error: ${{ matrix.experimental == true }}
     env:
       BUNDLE_GEMFILE: gemfiles/rails_${{ matrix.rails_version }}.gemfile
     steps: