Do not reject events from headless Chrome on release candidate environment

Author: rdk08

lib/plausible_web/controllers/api/external_controller.ex

@@ -168,7 +168,7 @@ defmodule PlausibleWeb.Api.ExternalController do
   defp is_bot?(%UAInspector.Result.Bot{}), do: true
 
   defp is_bot?(%UAInspector.Result{client: %UAInspector.Result.Client{name: "Headless Chrome"}}) do
-    if Application.get_env(:plausible, :system_environment) == "staging" do
+    if Application.get_env(:plausible, :system_environment) in ["staging", "rc"] do
       false
     else
       true