CI should install the same Rails version as the template requires

.github/workflows/ci.yml

@@ -122,7 +122,6 @@ jobs:
           --health-interval 10s
           --health-timeout 5s
           --health-retries 5
-
     steps:
       - name: Checkout this repo
         uses: actions/checkout@v4
@@ -174,4 +173,7 @@ jobs:
           PGUSER: postgres
           PGPASSWORD: postgres
           PGHOST: localhost
+          # This version constraint string must match the value of the
+          # RAILS_REQUIREMENT constant in `./template.rb`
+          RAILS_VERSION_CONSTRAINT: '~> 7.1.1'
         run: ./ci/bin/build-and-test

ci/bin/build-and-test

@@ -17,6 +17,8 @@ config_path = if ENV.fetch("CONFIG_PATH", "") == ""
 config_env_var = %Q(CONFIG_PATH="#{config_path}") if config_path
 skip_flags = ENV.fetch("SKIPS", "--skip-javascript --skip-docker")
 
+rails_version_constraint = ENV.fetch("RAILS_VERSION_CONSTRAINT")
+
 puts "=" * 80
 puts <<~EO_CONFIG_SUMMARY
   Config summary:
@@ -33,7 +35,7 @@ puts "=" * 80
 raise "Missing config YML file" if config_path && !(File.exist?(config_path) && File.file?(config_path))
 
 puts "Installing latest rails gem"
-system "gem install rails --no-document"
+system "gem install rails --version '#{rails_version_constraint}' --no-document"
 
 unless Dir.exist?(builds_path)
   puts "Creating #{builds_path}"

template.rb

@@ -2,6 +2,12 @@
 require "shellwords"
 require "pp"
 
+# Express the Rails version as a requirement so that we will automatically
+# support the most recent patch version
+#
+# IMPORTANT: When you change this you must also update the
+# `RAILS_VERSION_CONSTRAINT` environment variable in `.githug/ci.yml` to ensure
+# that the CI runs against the correct version of Rails.
 RAILS_REQUIREMENT = "~> 7.1.1".freeze
 
 ##