caddy-frontend: Check how stale-if-error is respected

6 jobs for master in 0 seconds
Status Job ID Name Coverage
  External
passed SlapOS.SlapRunner.ResilienceTest-Master

00:25:18

failed SlapOS.SlapRunner.ResilienceTest-Master.ERP5

00:12:41

failed SlapOS.SoftwareReleases.IntegrationTest-Master.Python2

06:01:26

passed SlapOS.SoftwareReleases.IntegrationTest-Master.Python3

03:55:10

passed SlapOS.SoftwareReleases.IntegrationTest-Master.Python2

04:37:40

passed SlapOS.SoftwareReleases.IntegrationTest-Master.Python3

03:07:54