refactor: extract patroni sql dependencies in lib

Steve Xuerebrequested to merge
refactor/extract-depend-on-patroni into master

What

  • Refactor the common patroni dependencies.
  • Add README file showing off how to use the library.

Why

patroni is a downstream dependency for a lot of services such as api, git, web. This resulted into a lot of duplication of code.

Testing

To make sure there are no diffs between the master branch and this branch run the following:

git switch master
./alertmanager/generate.sh && cp alertmanager/alertmanager.yml /tmp/alertmanager.old
git switch refactor/extract-depend-on-patroni
./alertmanager/generate.sh && cp alertmanager/alertmanager.yml /tmp/alertmanager.new
diff /tmp/alertmanager.old /tmp/alertmanager.new

Reference: https://gitlab.com/gitlab-com/gl-infra/reliability/-/issues/15998

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