add llvm-tools-preview component to rust-toolchain #10

	name: CosmOS CI harness

	on:
	push:
	branches:
	- main
	pull_request:
	types: [ opened, synchronize, reopened ]
	branches:
	- main

	env:
	CARGO_TERM_COLOR: always

	jobs:
	build:
	name: build
	runs-on: ubuntu-latest
	steps:
	- name: Checkout sources
	uses: actions/checkout@v2
	- name: Cache dependencies
	id: cache-dependencies
	uses: actions/cache@v2
	with:
	path: \|
	~/.cargo/registry
	~/.cargo/git
	target
	key: ${{ runner.os }}-cargo-${{ hashFiles('**/Cargo.lock') }}
	- uses: dtolnay/rust-toolchain@stable
	with:
	toolchain: nightly
	targets: "x86_64-unknown-none"
	components: "rust-src, llvm-tools-preview"
	- uses: actions-rs/cargo@v1
	with:
	command: build
	args: --verbose
	- name: Upload artifact
	uses: actions/upload-artifact@v3
	with:
	name: bios
	path: target/debug/build/cosmos-*/out/bios.img

	fmt:
	name: fmt
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v2
	- uses: dtolnay/rust-toolchain@stable
	with:
	toolchain: nightly
	components: rustfmt
	- uses: actions-rs/cargo@v1
	with:
	command: fmt
	args: --all -- --check
	clippy:
	name: clippy
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v2
	- name: Cache dependencies
	id: cache-dependencies
	uses: actions/cache@v2
	with:
	path: \|
	~/.cargo/registry
	~/.cargo/git
	target
	key: ${{ runner.os }}-cargo-${{ hashFiles('**/Cargo.lock') }}
	- uses: dtolnay/rust-toolchain@stable
	with:
	toolchain: nightly
	components: "clippy, rust-src, llvm-tools-preview"
	- uses: actions-rs/cargo@v1
	with:
	command: clippy
	args: -- -D warnings

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