Add tidying and linting for shell code and clean some shell up #215

	name: Lint

	on:
	push:
	branches:
	- "**"
	tags-ignore:
	- "precious-*"
	pull_request:

	env:
	CRATE_NAME: precious
	RUST_BACKTRACE: 1

	# There's not much value in running self-check on multiple platforms. Either
	# we're lint-clean or not. We do run on each rust target to catch warnings
	# coming from clippy in future rust versions.
	jobs:
	lint:
	name: Lint self
	runs-on: ubuntu-latest
	strategy:
	fail-fast: false
	matrix:
	toolchain:
	- stable
	- beta
	- nightly
	steps:
	- uses: actions/checkout@v4
	- name: Cache cargo & target directories
	uses: Swatinem/rust-cache@v2
	- name: Install toolchain
	uses: dtolnay/rust-toolchain@stable
	with:
	toolchain: ${{ matrix.toolchain }}
	components: rustfmt
	- name: Run cargo check
	run: cargo install --path . --locked
	- name: Install mise
	run: \|
	set -e
	set -x
	curl https://mise.run \| sh
	mise install
	- name: "Run precious --lint"
	run: $HOME/.cargo/bin/precious --debug lint --all

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