.github/workflows/ci: add machete to CI

[Mossaka]

this will check if there are unused deps in this repo

[mxpv]

Try rebase?

[Mossaka]

Ah the issue was not about rebase. The error from cargo machete says

containerd-snapshots -- ./crates/snapshots/Cargo.toml:
	prost
containerd-client -- ./crates/client/Cargo.toml:
	prost

we probably want to ignore prost dependency as it's actually being used.

[Mossaka]

Can we merge this PR? @mxpv

[mxpv]

@Mossaka could you pls rebase against latest main? Looks like there is a CI issue that needs to be addressed first.

[Mossaka]

Looks like I need to rebase this one