refactor: use sparse crates index #375

	name: Premerge

	on:
	pull_request:
	types: [opened, synchronize, reopened]
	push:
	branches: [main]
	schedule:
	- cron: 0 0 1 * *

	jobs:
	build-and-test:
	runs-on: ubuntu-latest
	steps:
	- name: checkout source
	uses: actions/checkout@v3

	- name: install Rust
	uses: actions-rust-lang/setup-rust-toolchain@v1.4.3

	- name: check
	run: cargo check

	- name: test
	run: cargo test

	linting:
	if: ${{ github.ref != 'main' }}
	runs-on: ubuntu-latest
	steps:
	- name: checkout source
	uses: actions/checkout@v3

	- name: install Rust
	uses: actions-rust-lang/setup-rust-toolchain@v1.4.3
	with: { components: rustfmt, clippy }

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

	- name: clippy
	uses: actions-rs/clippy-check@v1
	with:
	token: ${{ secrets.GITHUB_TOKEN }}
	args: -- -D warnings

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