Add stale issues policy in CONTRIBUTING.md. #95

	name: Smart Contract Build & Test

	on:
	push:
	branches:
	- main
	- "v*.[0-9]"
	pull_request:
	types: [opened, synchronize, reopened, ready_for_review]

	env:
	CARGO_TERM_COLOR: always

	permissions:
	contents: read

	jobs:
	build_and_test:
	name: Rust project - latest
	runs-on: ubuntu-latest
	strategy:
	matrix:
	toolchain:
	- stable
	steps:
	- name: Harden Runner
	uses: step-security/harden-runner@eb238b55efaa70779f274895e782ed17c84f2895 # v2.6.1
	with:
	disable-sudo: true
	egress-policy: block
	allowed-endpoints: >
	api.github.com:443
	coveralls.io:443
	crates.io:443
	github.com:443
	index.crates.io:443
	objects.githubusercontent.com:443
	static.crates.io:443
	static.rust-lang.org:443

	- uses: actions/checkout@f43a0e5ff2bd294095638e18286ca9a3d1956744 # v3.6.0
	- run: rustup update ${{ matrix.toolchain }} && rustup default ${{ matrix.toolchain }}
	- run: rustup target add wasm32-unknown-unknown
	- name: Contract Build
	run: \|
	cargo build --target wasm32-unknown-unknown --release
	- name: Code Verifications
	run: \|
	cargo clippy --all-targets --all-features -- -D warnings
	- name: Format code
	run: \|
	cargo fmt --check
	- name: Code Tests and coverage
	uses: actions-rs/tarpaulin@044a1e5bdace8dd2f727b1af63c1d9a1d3572068 # v0.1.3
	with:
	version: 0.22.0
	args: --all-features --fail-under 97.0 --out Lcov
	- name: Upload to Coveralls
	uses: coverallsapp/github-action@09b709cf6a16e30b0808ba050c7a6e8a5ef13f8d # master
	with:
	github-token: ${{ secrets.GITHUB_TOKEN }}
	path-to-lcov: "./lcov.info"

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