Adds skip functionality into the backup utility.
requested to merge matthias.vandemeent/CNG:charts/gitlab-702-backup-utility-in-task-runner-fails into master
Skip functionality is only implemented yet for the 'backup' task.
Functionality is implemented as a multi-use command line argument --skip <component>, with db, repositories and any of the object stores (e.g. lfs, artifacts) as component.
Implements a native workaround for charts/gitlab#702 by easily allowing skipping, instead of needing to manually alter a file in a container..
cc gitlab-com/marketing/community-relations/contributor-program/gitlab-hackathon/q4-2018-hackathon#1
Edited by Matthias van de Meent