Add various env variables
What does this MR do?
It exposes more env variables.
Are there points in the code the reviewer needs to double check?
It would be my first commit, and I'm not really a rails developer. I'm not sure it doesn't collide with other initialization, but I did my best.
Why was this MR needed?
Working on docker, it is always better to have as much as possible env variables, it makes things a lot easier to configure. This MR would allow to remove this: https://gitlab.com/charts/charts.gitlab.io/blob/master/charts/gitlab-ce/templates/configmap.yaml#L17-51
Does this MR meet the acceptance criteria?
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Changelog entry added, if necessary -
Documentation created/updated -
API support added - Tests
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Added for this feature/bug -
All builds are passing
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Conform by the merge request performance guides -
Conform by the style guides -
Branch has no merge conflicts with master(if it does - rebase it please) -
Squashed related commits together