Minimize CI matrix to earliest and latest versions

.github/workflows/ci.yml

@@ -14,8 +14,8 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ruby: ["3.2", "3.3", "3.4", "4.0"]
-        rails: ["7.2", "8.0", "8.1"]
+        ruby: ["3.2", "4.0"]
+        rails: ["7.2", "8.1"]
 
     services:
       postgres:
@@ -34,9 +34,10 @@ jobs:
 
     env:
       POSTGRES_USER: postgres
+      RAILS_VERSION: ${{ matrix.rails }}
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v6
 
       - name: Set up Ruby
         uses: ruby/setup-ruby@v1

Gemfile

@@ -1,7 +1,12 @@
 source "https://rubygems.org"
 
+rails_version = ENV.fetch("RAILS_VERSION", "8.1")
+
 gemspec
 
+gem "activerecord", "~> #{rails_version}.0"
+gem "railties", "~> #{rails_version}.0"
+
 gem "bundler", ">= 1.5"
 gem "pg"
 gem "pry"

README.md

@@ -114,6 +114,22 @@ column value instead of a plain string.
 - [Oracle](https://github.com/zygotecnologia/fx-oracle-adapter)
 - [SQLserver](https://github.com/tarellel/fx-sqlserver-adapter)
 
+## Version Support
+
+F(x) follows the maintenance policies of Ruby and Rails, supporting versions
+within their official maintenance windows.
+
+**Ruby:** 3.2+ ([maintenance branches])
+
+**Rails:** 7.2, 8.0, 8.1 ([maintenance policy])
+
+When a Ruby or Rails version reaches end-of-life, support will be dropped in the
+next minor release of F(x). Older versions may continue to work but are not
+tested or guaranteed.
+
+[maintenance branches]: https://www.ruby-lang.org/en/downloads/branches/
+[maintenance policy]: https://rubyonrails.org/maintenance
+
 ## Contributing
 
 See [contributing](CONTRIBUTING.md) for more details.