Specify collation for Postgres DBs

I do think it makes sense to use C.UTF-8 as it does not depend on OS locale settings and hence is deterministic across Postgres instances.

With en_US.UTF-8 any updates to glibc or ICU could affect the existing sorting order. If it is really needed, it can still be defined on column level.

Author: sislr

ruby_on_rails/app_initialisation.md

@@ -40,6 +40,10 @@ Some other adjustments must be performed manually.
 
 ### Automatic adjustments
 
+> ⭐️The `config/database.yml` is updated to have a `collation: C.UTF-8` setting.
+> This ensures deterministic, locale-independent sorting and avoids inconsistencies between local and production
+> environments.
+
 > ⭐The Gemfile reads the required ruby version from the `.ruby-version` file.
 > [This is used by Heroku to determine what version to use.](https://devcenter.heroku.com/articles/ruby-versions)
 > Deploio reads the ruby version from the Gemfile, with the .ruby-version file inlined into it. https://paketo.io/docs/howto/ruby/#override-the-detected-ruby-version

ruby_on_rails/template.rb

@@ -1,5 +1,9 @@
-# replace rubocop-rails-omakase with renuocop
+# configure the database collation
+insert_into_file "config/database.yml", after: "adapter: postgresql\n" do
+  "  template: template0\n  collation: C.UTF-8\n"
+end
 
+# replace rubocop-rails-omakase with renuocop
 gsub_file "Gemfile", /gem "rubocop-rails-omakase"/, "gem \"renuocop\""
 
 insert_into_file "Gemfile", after: /^group :development do\n/ do