implement shutdown option

this MR implements a global shutdown option that rolling out new pods with the helm chart (i.e. it disables the deployment/deploymentconfig, the cronjobs and the workers.

merged

assigned to @philipp.sommer

enabled an automatic merge when the pipeline for d1336c90 succeeds

mentioned in commit 4fa2a0d2

mentioned in commit hcdc/kubernetes/charts/nginx@3054b27c

mentioned in merge request hcdc/kubernetes/charts/nginx!17 (merged)