Write more comprehensive README #14

	name: CI
	on:
	pull_request:
	push:

	permissions:
	contents: read

	env:
	RUST_BACKTRACE: full

	jobs:
	style:
	name: Code style
	runs-on: ubuntu-latest
	timeout-minutes: 15
	steps:
	- name: Checkout
	uses: actions/checkout@v4
	- name: Install Rust stable
	uses: dtolnay/rust-toolchain@stable
	- name: cargo fmt
	run: cargo fmt --all -- --check
	- name: cargo clippy
	run: cargo clippy --workspace --all-targets -- -Dwarnings
	- name: cargo doc
	run: cargo doc --workspace
	env:
	RUSTDOCFLAGS: -Dwarnings

	test:
	strategy:
	matrix:
	rust: [stable, '1.76'] # NB. Sync with Cargo.toml.
	name: Test ${{ matrix.rust }}
	runs-on: ubuntu-latest
	timeout-minutes: 15
	steps:
	- name: Checkout
	uses: actions/checkout@v4
	- name: Install Rust stable
	uses: dtolnay/rust-toolchain@master
	with:
	toolchain: ${{ matrix.rust }}
	- name: Build
	run: cargo build --workspace --all-targets
	# orb-ublk tests hang for unknow reasons.
	- name: Test
	run: cargo test --all-targets

	nix-flake:
	name: Flake package
	runs-on: ubuntu-latest
	timeout-minutes: 15
	steps:
	- name: Checkout
	uses: actions/checkout@v4
	- name: Install Nix
	uses: cachix/install-nix-action@v26
	with:
	github_access_token: ${{ secrets.GITHUB_TOKEN }}
	- name: Flake check
	run: nix flake check --no-update-lock-file --show-trace
	- name: Flake build
	run: nix build --no-update-lock-file --show-trace --print-build-logs

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