caddy-frontend: Make TestHandler configurable

5 jobs for fix/erp5-apachedex-millisecond
Status Job ID Name Coverage
  External
passed SlapOS.SlapRunner.ResilienceTest-Master

00:23:46

failed SlapOS.SlapRunner.ResilienceTest-Master.ERP5

00:35:14

failed SlapOS.SoftwareReleases.IntegrationTest-Master.Python3

passed SlapOS.SlapRunner.ResilienceTest-Master

00:25:21

failed SlapOS.SlapRunner.ResilienceTest-Master.ERP5

00:29:23