Rust

Add rustfmt and clippy configuration, and clean the tree under it #5

	name: Rust

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

	env:
	CARGO_TERM_COLOR: always

	jobs:
	build:

	runs-on: ubuntu-latest

	steps:
	- uses: actions/checkout@v4
	- name: Install toolchain components
	run: rustup component add rustfmt clippy

	# Cheap checks first, so a formatting slip does not wait on a build.
	- name: Formatting
	run: cargo fmt --all --check

	# Lint levels come from [lints] in Cargo.toml; -D turns them into failures
	# here without changing what a contributor sees locally.
	- name: Clippy
	run: cargo clippy --all-targets --all-features -- -D warnings

	# The embedded build drops the portal and with it the only dependency tree,
	# leaving the syscall backends. Most of the unsafe code is only compiled in
	# this configuration's cfg set, so linting the default one is not enough.
	- name: Clippy (no portal)
	run: cargo clippy --all-targets --no-default-features --features drm,fbdev -- -D warnings

	- name: Build
	run: cargo build --verbose --all-features
	- name: Build (no portal)
	run: cargo build --verbose --no-default-features --features drm,fbdev
	- name: Run tests
	run: cargo test --verbose --all-features

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