Truncate build matrix

Author: JonRowe

.github/workflows/ci.yml

@@ -36,59 +36,13 @@ jobs:
       fail-fast: false
       matrix:
        include:
-         # Edge Rails (?) builds >= 2.7
          - ruby: 3.2
-           env:
-             RAILS_VERSION: 'main'
-         - ruby: 3.1
-           env:
-             RAILS_VERSION: 'main'
-
-         # Rails 7.1 builds >= 2.7
-         - ruby: 3.2
-           env:
-             RAILS_VERSION: '~> 7.1.0'
-         - ruby: 3.1
-           env:
-             RAILS_VERSION: '~> 7.1.0'
-         - ruby: '3.0'
            env:
              RAILS_VERSION: '~> 7.1.0'
          - ruby: 2.7
            env:
              RAILS_VERSION: '~> 7.1.0'
 
-         # Rails 7.0 builds >= 2.7
-         - ruby: 3.2
-           env:
-             RAILS_VERSION: '~> 7.0.0'
-         - ruby: 3.1
-           env:
-             RAILS_VERSION: '~> 7.0.0'
-         - ruby: '3.0'
-           env:
-             RAILS_VERSION: '~> 7.0.0'
-         - ruby: 2.7
-           env:
-             RAILS_VERSION: '~> 7.0.0'
-
-         # Rails 6.1 builds >= 2.5
-         - ruby: 3.1
-           env:
-             RAILS_VERSION: '~> 6.1.0'
-         - ruby: '3.0'
-           env:
-             RAILS_VERSION: '~> 6.1.0'
-         - ruby: 2.7
-           env:
-             RAILS_VERSION: '~> 6.1.0'
-         - ruby: 2.6
-           env:
-             RAILS_VERSION: '~> 6.1.0'
-         - ruby: 2.5
-           env:
-             RAILS_VERSION: '~> 6.1.0'
-
     env: ${{ matrix.env }}
     steps:
       - uses: actions/checkout@v4