Ghe Backup Versions Save

• detects cloud environment (AWS or K8s) based on downward API label file in addition to taupage yaml file check
• introduces a delivery.yaml file to build on Kubernetes / CDP
• uses a statefulset to run ghe-backup on Kubernetes
• only one Dockerfile using docker cache
• dockerfile & cron w/o root
• synchronised cron schedules

ghe-backup-volume could not be mounted again after a failure/termination or stop (https://github.com/zalando/ghe-backup/issues/75) hourly backups (https://github.com/zalando/ghe-backup/issues/57)

bug fixes:

• docker image creation (https://github.com/zalando/ghe-backup/issues/61)
• clean repository (https://github.com/zalando/ghe-backup/issues/59)

• got rid of many zombie backup processes #51
• backup orchestration #49 #40