Merge branch 'rubymine-spring-debug-support' into 'master'

Fix spring configuration to allow RubyMine execute the debugger

See merge request gitlab-org/gitlab!39482

config/spring.rb

@@ -4,3 +4,13 @@
   tmp/restart.txt
   tmp/caching-dev.txt
 ).each { |path| Spring.watch(path) }
+
+Spring.after_fork do
+  if ENV['DEBUGGER_STORED_RUBYLIB']
+    ENV['DEBUGGER_STORED_RUBYLIB'].split(File::PATH_SEPARATOR).each do |path|
+      next unless path =~ /ruby-debug-ide/
+
+      load path + '/ruby-debug-ide/multiprocess/starter.rb'
+    end
+  end
+end