Add Rails 7.2 to CI matrix

Author: pirj

.github/workflows/ci.yml

@@ -44,6 +44,17 @@ jobs:
            env:
              RAILS_VERSION: 'main'
 
+         # Rails 7.2 builds >= 3.1
+         - ruby: 3.3
+           env:
+             RAILS_VERSION: '~> 7.2.0'
+         - ruby: 3.2
+           env:
+             RAILS_VERSION: '~> 7.2.0'
+         - ruby: 3.1
+           env:
+             RAILS_VERSION: '~> 7.2.0'
+
          # Rails 7.1 builds >= 2.7
          - ruby: 3.2
            env: