Allow to define custom HTTP headers per each frontend

test/pleroma/web/plugs/http_security_plug_test.exs

@@ -75,7 +75,14 @@ defmodule Pleroma.Web.Plugs.HTTPSecurityPlugTest do
 
     test "it sets the Service-Worker-Allowed header", %{conn: conn} do
       clear_config([:http_security, :enabled], true)
-      clear_config([:http_security, :service_worker_allowed], "/")
+      clear_config([:frontends, :primary], %{"name" => "fedi-fe", "ref" => "develop"})
+
+      clear_config([:frontends, :available], %{
+        "fedi-fe" => %{
+          "name" => "fedi-fe",
+          "custom-http-headers" => [{"service-worker-allowed", "/"}]
+        }
+      })
 
       conn = get(conn, "/api/v1/instance")
       assert Conn.get_resp_header(conn, "service-worker-allowed") == ["/"]