Improve GitLab Geo replicated database support

This is not DR support, its regular Geo. Since last time support was added to GDK, we changed from recommending the use of multiple GitLab instances in the same GDK directory to each one isolated in a different one. So this has to be reflected into Geo instructions as well.

cc @dbalexandre @rspeicher @stanhu

restored source branch geo-replication

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• 13d3632a - Improve GitLab Geo replicated database support

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It sounds like we need to reconcile this with !258 (merged).

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• 179f015d - Improve GitLab Geo replicated database support

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• 7f4dc40a - Improve GitLab Geo replicated database support

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assigned to @rspeicher

I've added and additional script to setup wal stuff to the postgresql.conf file.

resolved all discussions

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• 99210efd - Improve GitLab Geo replicated database support

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• c06a7b66 - Improve GitLab Geo replicated database support

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added 2 commits

• 8dadd157 - Update position of the postgresql-primary gitignore
• 4ab55ffe - Expand the Geo and Replication instructions

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mentioned in issue #217

resolved all discussions

mentioned in commit d1e3b49e

merged

Thanks @brodock!

mentioned in merge request !258 (merged)