Start testing Ruby 4 against all supported Rails versions

Note, excludes primary Gemfile for now due to needing Minitest 6.

Author: larouxn

.github/workflows/ci.yml

@@ -24,14 +24,20 @@ jobs:
         - gemfiles/rails_8_0.gemfile
         - Gemfile # current minor release
         - gemfiles/rails_main.gemfile
-        ruby: ["3.2", "3.3", "3.4"]
+        ruby: ["3.2", "3.3", "3.4", "4.0"]
         database: [sqlite]
         include:
         - gemfile: "gemfiles/postgresql.gemfile"
           ruby: 3.4
           database: postgres
-        - gemfile: "gemfiles/rails_main.gemfile"
+        - gemfile: "gemfiles/postgresql.gemfile"
+          ruby: 4.0
+          database: postgres
+        exclude:
+        # TODO: Upgrade default Gemfile to Minitest 6 to pickup Ruby 4 support
+        - gemfile: Gemfile
           ruby: 4.0
+          database: sqlite
     env:
       BUNDLE_GEMFILE: ${{ matrix.gemfile }}
       DB: ${{ matrix.database }}