Deploy django applications (deposit, webapp) with swh-charts

That will help for the migration to django 4.1.

It's currently deployed on bullseye nodes with no longer maintained django version 2.2. There is no urgency just yet though as current applications' code are still compatible with django 2.2.

deposit:

• standard django use (w/ postgresql backend)
• specific nfs volume mountpoint to saam for the archive storage (that could change to something else, ceph mountpoint or something)
• one public facing main api app
• another private facing api app for the workers (worker use: checker, loader)

webapp:

• standard django use (w/ postgresql backend)
• [fill-in-the-blanks]

For both, as per @anlambert's remark on current debian post installation step, this new deployment should also take care of the (swh) django migration model (doable already, we do something equivalent for the configuration generation btw).

[1] swh/devel/swh-web#4734 (comment 130990)

Related to swh/devel/swh-deposit#4626