DB inventory and documentation

Right now, to make an inventory (like migrated/migration$403), i did connect to each node, each cluster and use \l+. Then copy/paste the output and make an org-mode table out of it. Then crop the unnecessary columns (using org-mode).

This is tedious ;) It'd be great to automate this (not necessarily the way i manually did it). So that we can update some inventory documentation with it.

Summing up:

• Create an inventory documentation out of migrated/migration$403 - [1]

• Automate the documentation update (could be a cli which dumps an output ready to update the wiki page)https://intranet.softwareheritage.org/wiki/Databases_inventoryhttps://intranet.softwareheritage.org/wiki/Databases_inventory

• [1] https://intranet.softwareheritage.org/wiki/Databases_inventory

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Migrated from T1745 (view on Phabricator)