add gitlab:backup:create ONLY option

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Problem to solve

Trying to only backup certain items is risky as you have to make sure you always have all the latest SKIP options set, add a ONLY option that only backs up what you want.

Further details

For example, make an easy reusable command to only backup database even if new SKIP options are added.

Proposal

Add ONLY option, e.g. gitlab:backup:create ONLY=db

What does success look like, and how can we measure that?

gitlab:backup:create ONLY=db should only backup database.

Links / references

https://docs.gitlab.com/ce/raketasks/backup_restore.html#excluding-specific-directories-from-the-backup

Edited by 🤖 GitLab Bot 🤖