Make rails main fail the build

Author: JonRowe

.github/workflows/ci.yml

@@ -38,19 +38,15 @@ jobs:
        include:
          # Edge Rails (7.1) builds >= 2.7
          - ruby: 3.2
-           allow_failure: true
            env:
              RAILS_VERSION: 'main'
          - ruby: 3.1
-           allow_failure: true
            env:
              RAILS_VERSION: 'main'
          - ruby: '3.0'
-           allow_failure: true
            env:
              RAILS_VERSION: 'main'
          - ruby: 2.7
-           allow_failure: true
            env:
              RAILS_VERSION: 'main'