Use the GITLAB_INITIAL_ROOT_PASSWORD env var if available

qa/qa/runtime/env.rb

@@ -144,6 +144,10 @@ module QA
         ENV['GITLAB_PASSWORD']
       end
 
+      def initial_root_password
+        ENV['GITLAB_INITIAL_ROOT_PASSWORD']
+      end
+
       def github_username
         ENV['GITHUB_USERNAME']
       end

qa/qa/runtime/user.rb

@@ -18,7 +18,7 @@ module QA
       end
 
       def default_password
-        '5iveL!fe'
+        Runtime::Env.initial_root_password || '5iveL!fe'
       end
 
       def username