rspec_profiling: Discover the correct branch name in GitLab CI

config/initializers/rspec_profiling.rb

@@ -4,6 +4,12 @@ module RspecProfilingConnection
   end
 end
+module RspecProfilingGitBranchCi
+  def branch
+    ENV['CI_BUILD_REF_NAME'] || super
+  end
+end
+
 if Rails.env.test?
   RspecProfiling.configure do |config|
     if ENV['RSPEC_PROFILING_POSTGRES_URL']
@@ -11,4 +17,6 @@ if Rails.env.test?
       config.collector = RspecProfiling::Collectors::PSQL
     end
   end
+
+  RspecProfiling::VCS::Git.prepend(RspecProfilingGitBranchCi) if ENV.has_key?('CI')
 end