refactor(rust) :: pin toolchain with rust-toolchain.toml

[81reap]

Before the Dockerfile pinned 1.95 but the CI steps would use the current stable version of Rust.

Now they are all pinned to the same version via rust-toolchain.toml. This requires using actions-rust-lang/setup-rust-toolchain as it respects the toml file.

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[lovasoa]

@81reap Just a detail, but : could you please name your commits "fix" or "feat" only when they impact actual SQLPage users ? You can use "refactor" for commits that improve the architecture without user-visible changes.

[lovasoa]

actions-rust-lang/setup-rust-toolchain sounds like a tiny personal project, are you sure it's reasonable?

I'm not a huge fan of pinning the rust version independently in one more place.

[81reap]

oh it didn't seem like a tiny project

https://github.com/search?q=%22actions-rust-lang%2Fsetup-rust-toolchain%22&type=code

and it does respect the toml so we would be only pinning Rust independently in one place

https://github.com/actions-rust-lang/setup-rust-toolchain/blob/c8ff772090ab9d00f7f7bd7b388f3c3032282e3b/action.yml#L205-L218

it's also based off the existing action we use

https://github.com/actions-rust-lang/setup-rust-toolchain/blob/c8ff772090ab9d00f7f7bd7b388f3c3032282e3b/README.md?plain=1#L9

the existing action has an issue about this that's closed as completed

dtolnay/rust-toolchain#116

but there is no reference to toml in the codebase

https://github.com/search?q=repo%3Adtolnay%2Frust-toolchain+toml&type=code

I am not aware of any offical Rust Github Action that would fit the needs we want here