Add notes from setting up fresh sidekiq servers

docs/WMCLOUD_SETUP/sidekiq_servers.md

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+These are notes from setting up a fresh set of servers for Sidekiq workers, July 2, 2024.
+
+My strategy this time is to put every worker on a separate VM, so try to make the bottlenecks and failures for too-large updates more isolated.
+
+* Create servers (8-core for long, 4-core for medium, 1-core for short queue).
+
+## Each server
+
+- Spin up a fresh server and log in to it
+- Install requirements:
+  - `sudo apt install pandoc libmariadb-dev imagemagick gnupg2 shared-mime-info`
+- Install RVM (see web server doc)
+- Get the Dashboard code: `git clone https://github.com/WikiEducationFoundation/WikiEduDashboard.git`
+- In the Dashboard directory:
+  - `bundle install`
+  - Copy `application.yml`, `database.yml`, `secrets.yml`, `newrelic.yml` from the web node into the `config` directory
+
+- Add the systemd service files for the sidekiq processes you want to run on this server.
+  - Make sure the path is correct for RVM in `ExecStart`
+  - Update the `WorkingDirectory` to something like `/home/ragesoss/WikiEduDashboard`
+
+- Enable and start the service
+
+To update for new deployments, you'll need to quiet these sidekiq processes, stop them, do a `git pull` and `bundle install`, then restart the sidekiq processes.