add workflow for coverage #1

	name: coverage
	# This CI is run manually on-demand and performs a simple calculation of
	# unit tests coverage and reports it to CodeCov
	permissions:
	contents: read
	on:
	workflow_dispatch:
	push:
	branches:
	- 'polkadot-v1.10.0-coverage'

	jobs:
	coverage:
	runs-on: ubuntu-latest
	name: Code Coverage
	steps:
	- uses: actions/checkout@v4
	with:
	submodules: true

	- name: Install stable
	uses: dtolnay/rust-toolchain@stable
	with:
	components: llvm-tools-preview

	- name: Install cargo-llvm-cov
	uses: taiki-e/install-action@cargo-llvm-cov

	- name: Generate lockfile if it doesn't exist
	if: hashFiles('Cargo.lock') == ''
	run: cargo generate-lockfile

	- name: Generate coverage report
	# Follow the `test-release`command in the Makefile
	# but without release mode to avoid long build times
	run: cargo llvm-cov --lib --all --locked --lcov --output-path lcov.info

	- name: Record Rust version
	run: echo "RUST=$(rustc --version)" >> "$GITHUB_ENV"

	- name: Upload to codecov.io
	uses: codecov/codecov-action@v4
	with:
	fail_ci_if_error: true
	env_vars: OS,RUST

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