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Add gitlab-rake db:schema:dump

Anton Smith requested to merge docs/add-gitlab-rake-db-schema-dump into master

What does this MR do?

In Support, we will on occasion need to ask customers for a copy of their database schema to troubleshoot an odd problem relating to the database and all the database migrations are up.

In my experience, when I've had to request for a schema, they have an index or default value missing for whatever reason.

Let's add the command to our docs so others can make use of it, and also give readers an idea on how to use it to compare their schema to what's committed for their version.

Related issues

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  • ~"frontend"
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  • ~"type::bug"
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