chore(ci): Install diesel_cli with just postgres feature

[joonas]

I noticed #311 was failing on the diesel_cli install step.

Digging in a bit, I noticed the ubuntu-latest runner image was changed to point from Ubuntu 22.04, which has libsqlite3-dev installed by default, to Ubuntu 24.04 instead and that no longer includes libsqlite3-dev in the default apt packages.

This simply adjusts the features that are enabled from defaults to just postgres, which is what the CI workflow uses.

Additionally I folded in the changes from #313:

Per the failure in #312, Rust 1.84 deprecated wasm32-wasi target, and thus it now needs to be set to either wasm32-wasip1 or wasm32-wasip2.

I wasn't sure if we wanted to target p1 or p2, so I defaulted to p2, but happy to switch it to p1 if that's preferred.

[joonas]

@calvinrp PTAL when you get a chance 🙂

[calvinrp]

Thank you