Extract "how to prepare for an initial charm deployment"

[jugmac00]

... from https://github.com/canonical/launchpad-manual/blob/main/explanation/charms.rst

... starting with:

Taking the librarian as an example: charm/launchpad-librarian/layer.yaml lists the binaryfile-expire, librarian, librarianfeedswift, and librariangc roles as being required (this corresponds to the database users used by the services and jobs installed by that particular charm). 

We should also add a note about...

but you'll also need to make sure that ~/.local/share/mojo/LOCAL/mojo-lp/lp/qastaging/deploy-secrets has whatever it needs before you run upgrade-qastaging - I see you've edited external_services.db_connections, but you'll also need a launchpad-copy-archive-publisher: section a bit further down with build_label and rabbitmq_broker_urls entries, like some of the others there

4:34 PM
e.g. copy and paste the launchpad-ftpmaster-publisher: block and change the application name

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[jugmac00]

Also and especially make use of https://docs.google.com/document/d/1HPTVJIws0fQjXRkIJ40YKt0r55dd0Di3piWLI9yKjGs/edit#heading=h.dmjx5b3k9j5o