Add a release action #27

	name: Continuous integration
	on: [push, pull_request]

	jobs:
	check:
	name: Build and test

	runs-on: ubuntu-latest
	strategy:
	matrix:
	rust:
	- 1.77 # MSRV
	- stable
	- nightly

	steps:
	- name: Checkout code
	uses: actions/checkout@v4

	# https://doc.rust-lang.org/1.77.2/cargo/guide/cargo-home.html#caching-the-cargo-home-in-ci
	- name: Cargo cache (platform-independent)
	uses: actions/cache@v4
	with:
	path: \|-
	/home/runner/.cargo/.crates.toml
	/home/runner/.cargo/.crates2.json
	/home/runner/.cargo/registry/index/
	/home/runner/.cargo/registry/cache/
	/home/runner/.cargo/git/db/
	key: cargo-home-${{ matrix.rust }}

	- name: Cargo cache (build)
	uses: actions/cache@v4
	with:
	path: \|-
	target
	key: cargo-build-${{ runner.os }}-${{ matrix.rust }}

	- name: Cargo cache (build conformance)
	uses: actions/cache@v4
	with:
	path: \|-
	conformance/target
	key: cargo-build-conformance-${{ runner.os }}-${{ matrix.rust }}
	if: ${{ matrix.rust == 'stable' }}

	- name: Select Rust toolchain
	uses: dtolnay/rust-toolchain@master
	with:
	toolchain: ${{ matrix.rust }}
	components: rustfmt, clippy

	- name: Build code
	run: cargo build

	- name: Format code
	run: cargo fmt --all -- --check
	if: ${{ matrix.rust == 'stable' }}

	- name: Lint code
	run: cargo clippy -- -D warnings
	if: ${{ matrix.rust == 'stable' }}

	- name: Test conformance
	run: cd conformance && cargo run
	if: ${{ matrix.rust == 'stable' }}

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