Docker: update-permissions, only touch registry if exists

Add an exists check to the update-permissions script, so that it only attempts to set the permissions on the registry (/var/opt/gitlab/gitlab-rails/shared/registry) if it actually exists. This removes the spurious "fail" on setting permissions on things that don't exist, and allows for better scripting compatibility.

Set the /var/opt/gitlab/redis permissions to gitlab-redis:git if the git user exists. This brings the settings in-line with what is expected in the environment for the git user to be able to access the Redis instance.

Closes #2074 (closed)

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• 5613c8e0 - Docker: update-permissions: proper set redis dir permissions

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assigned to @marin

unmarked as a Work In Progress

mentioned in issue #2074 (closed)

assigned to @WarheadsSE

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• 811210f2 - Docker: update-permissions - alaways check path exists

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assigned to @marin

mentioned in merge request !1706 (merged)

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