Rust

Rust github workflow improvements #868

	# taking some ideas from
	# https://docs.github.com/en/actions/use-cases-and-examples/building-and-testing/building-and-testing-rust

	name: Rust

	on:
	push:
	branches: [ main ]
	pull_request:
	branches: [ main ]

	env:
	CARGO_TERM_COLOR: always

	jobs:
	test:
	name: "Test"
	runs-on: ubuntu-latest
	env:
	# should probably match pco's minimum required rust version
	RUST_VERSION: 1.74
	steps:
	- uses: actions/checkout@v4
	- uses: actions/cache@v4
	with:
	path: \|
	~/.cargo/registry
	~/.cargo/git
	target
	key: ${{ runner.os }}-${{ env.RUST_VERSION }}-cargo-${{ hashFiles('**/Cargo.lock') }}
	- name: Set Rust Toolchain Version
	run: \|
	rustup install ${{ env.RUST_VERSION }}
	rustup override set ${{ env.RUST_VERSION }}
	rustup component add clippy rustfmt
	- name: Test
	run: cargo test
	- name: Clippy
	run: cargo clippy --no-deps
	- name: Ensure formatted
	run: cargo fmt --check

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