chore: align ci with local dev

[juleswritescode]

• pin the rust toolchain to the version we use for the workspace
• reuse just commands in CI
• add steps where we print the versions of the tools used in CI
• install sqlx-cli with just install-tools and just upgrade-tools
• remove bun install from just upgrade-tools
• fixed all issues from clippy

the rust-toolchain.toml file was weird – it complained for the longest time that cargo fmt wasn't available with the 1.86.0 version, but now it just works. Seems to be just buggy sometimes

[willruggiano]

Have you guys ever dabbled with Nix? I have found that it excels at this sort of thing (i.e. dev/ci determinism/reproducibility).

There is a great blog post that was written primarily about building Docker images using Nix, but the sentiment applies to CI in general. But alas I am heavily invested and thus heavily biased :D

Anyways, if you are interested I'd be more than happy to discuss in detail with you. Or even if you aren't but are nonetheless curious! Thought I'd toss it out there considering I just went through a similar exercise in a repository of my own.