Auto-update Photon's db

For now, we do it by hand. I tried to automatize it (in cartesapp/serveur) but failed, it's a bit more complicated than I thought.

We're using JS to run scripts, that's OK. We just need to go further.

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We could also study the possibility of an Overpass instance in-house. To make requests faster, Overpass is a central piece of Cartes.

But the Overpass instance would need to be constantly (at least hourly) updated. Does it source itself from a planet.osm.pbf that we could keep updated and would be helpful for other purposes ?

⌚️2 day