test+ci: unit-test phase_for and add CI workflow #1

	name: CI

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

	env:
	CARGO_TERM_COLOR: always
	RUSTFLAGS: "-D warnings"

	jobs:
	check:
	name: fmt + clippy + test + build
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v4

	- name: Install Rust toolchain
	uses: dtolnay/rust-toolchain@stable
	with:
	components: rustfmt, clippy

	- name: Cache cargo registry and target
	uses: actions/cache@v4
	with:
	path: \|
	~/.cargo/registry
	~/.cargo/git
	target
	key: ${{ runner.os }}-cargo-${{ hashFiles('**/Cargo.lock') }}

	- name: Format check
	run: cargo fmt --all --check

	- name: Clippy
	run: cargo clippy --workspace --all-targets

	- name: Test
	run: cargo test --workspace

	- name: Build release
	run: cargo build --release

Provide feedback