Give Chrome longer to boot in system tests

Ferrum's 10 second default process_timeout is too tight on loaded CI
runners, where Chrome intermittently fails to publish its websocket
URL in time and the whole matrix cell errors before running.

Author: jorgemanrubia

action_text-trix/test/application_system_test_case.rb

@@ -5,7 +5,9 @@
 class ApplicationSystemTestCase < ActionDispatch::SystemTestCase
   driven_by :cuprite, using: :chrome, options: {
     js_errors: true,
-    headless: ENV["HEADLESS"] != "0"
+    headless: ENV["HEADLESS"] != "0",
+    # Ferrum's 10s default is too tight for Chrome to boot on loaded CI runners
+    process_timeout: 60
   }
 end