feat(ci): add gas-benching workflow (#204) #4

	name: gas-bench
	# This workflow checks that the compiled wasm binary of every example contract
	# can be deployed to Arbitrum Stylus.
	permissions:
	contents: read
	on:
	push:
	branches: [ main ]
	pull_request:
	concurrency:
	group: ${{ github.workflow }}-${{ github.head_ref \|\| github.run_id }}
	cancel-in-progress: true
	env:
	CARGO_TERM_COLOR: always
	jobs:
	required:
	name: gas usage report
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v4

	- name: set up rust
	uses: dtolnay/rust-toolchain@master
	id: toolchain
	with:
	target: wasm32-unknown-unknown
	components: rust-src
	toolchain: nightly-2024-01-01

	- uses: Swatinem/rust-cache@v2
	with:
	cache-on-failure: true

	- name: install solc
	run: \|
	curl -LO https://github.com/ethereum/solidity/releases/download/v0.8.21/solc-static-linux
	sudo mv solc-static-linux /usr/bin/solc
	sudo chmod a+x /usr/bin/solc

	- name: setup nitro node
	run: ./scripts/nitro-testnode.sh -d -i
	- name: run benches
	run: \|
	export NIGHTLY_TOOLCHAIN=${{steps.toolchain.outputs.name}}
	./scripts/bench.sh

Provide feedback