chore: Update Docker dev setup

Gemfile

@@ -2,19 +2,31 @@
 
 source 'https://rubygems.org'
 
-if ENV["DEVEL"] == "1"
-  gem 'rails', '~> 7.1.0'
+if ENV['DEVEL'] == '1'
+  # for Docker dev
+  rails_ver = ENV.fetch('RAILS_VERSION')
+  gem 'rails', rails_ver
 
-  gem 'activeadmin', '~> 3.3'
+  gem 'activeadmin', ENV.fetch('ACTIVEADMIN_VERSION')
   gem 'activeadmin_quill_editor', path: './'
+
+  if rails_ver.start_with?('7.0')
+    gem 'concurrent-ruby', '1.3.4'
+    gem 'sqlite3', '~> 1.4'
+  else
+    gem 'sqlite3'
+  end
 else
   gemspec
+
+  gem 'sqlite3'
 end
 
+gem 'bigdecimal'
+gem 'mutex_m'
 gem 'puma'
 gem 'sassc'
 gem 'sprockets-rails'
-gem 'sqlite3'
 
 # Testing
 gem 'capybara'