caddy-frontend: Improve readability of most complex template

8 jobs for erp5-component
Status Job ID Name Coverage
  External
passed SlapOS.SlapRunner.ResilienceTest-Master

00:28:10

failed SlapOS.SlapRunner.ResilienceTest-Master.ERP5

00:07:31

failed SlapOS.SoftwareReleases.IntegrationTest-Master.Python2

09:07:54

failed SlapOS.SoftwareReleases.IntegrationTest-Master.Python3

03:54:12

passed SlapOS.SlapRunner.ResilienceTest-Master

00:30:42

failed SlapOS.SlapRunner.ResilienceTest-Master.ERP5

00:09:50

failed SlapOS.SoftwareReleases.IntegrationTest-Master.Python2

failed SlapOS.SoftwareReleases.IntegrationTest-Master.Python3