Mongo support for Bookworm & avoid reinstall

[gcollin]

The problem

Only Mongo v7.0 is available for Bookworm. So all applications installing Mongo fails the Bookworm install.
As well can install an older version over a newer one if requested by an application.

Solution

Forced installation of v7 of Mongo if bookworm is detected.
Detects the version of Mongo installed and ensure no regression in installation.
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PR Status

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How to test

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[alexAubin]

Related notes from @orhtej2 : YunoHost-Apps/wekan_ynh#284 (comment)

but it's not clear to me in the end if an explicit migration is need to go from 4.x to 5 / 6 / 7.x or not ? Possibly we could somewhat magically upgrade mongo and run the appropriate migration stuff similar to what we already do for postgresql

[gcollin]

As per the official upgrade documentation, when upgrading Mongo, you just need to ensure step by step upgrade.
https://www.mongodb.com/docs/manual/release-notes/7.0-upgrade-standalone/

And then set the features compatibility to the latest version only if you want by running
db.adminCommand( { setFeatureCompatibilityVersion: "7.0" } )

So for me it's quite safe to upgrade the mongo version whenever it's not available in the target debian release.

What I can do in the script is check that we're not trying to upgrade more than 2 versions deep, and fail the install if so.