Use config.toml to configure Gitaly
What does this MR do?
Change the init script and the installation/update instructions to configure Gitaly via config.toml.
Are there points in the code the reviewer needs to double check?
Why was this MR needed?
Environment variables were not flexible enough to specify storage configuration.
Screenshots (if relevant)
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