Add a profiling action to CI which comments on PRs with notable demo art performance variances #13

	name: Rust Profiling with iai-callgrind

	on:
	pull_request:
	branches: [ master ]

	env:
	CARGO_TERM_COLOR: always

	jobs:
	profile:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v3
	with:
	fetch-depth: 0

	- name: Install Rust
	uses: actions-rs/toolchain@v1
	with:
	profile: minimal
	toolchain: stable

	- name: Install Valgrind
	run: \|
	sudo apt-get update
	sudo apt-get install -y valgrind

	- name: Cache dependencies
	uses: actions/cache@v3
	with:
	path: \|
	~/.cargo/registry
	~/.cargo/git
	target
	key: ${{ runner.os }}-cargo-${{ hashFiles('**/Cargo.lock') }}

	- name: Install iai-callgrind
	run: \|
	cargo install [email protected]

	# - name: Checkout master branch
	# run: \|
	# git fetch origin master:master
	# git checkout master

	- name: Run baseline benchmarks
	run: \|
	cargo bench --bench compile_demo_art --features=iai -- --save-baseline=master

	- name: Checkout PR branch
	run: \|
	git checkout ${{ github.event.pull_request.head.sha }}

	- name: Run PR benchmarks
	id: benchmark
	run: \|
	BENCH_OUTPUT=$(cargo bench --bench compile_demo_art --features=iai -- --baseline=master)
	ESCAPED_OUTPUT=$(echo "$BENCH_OUTPUT" \| jq -sR .)
	echo "BENCHMARK_OUTPUT=$ESCAPED_OUTPUT" >> $GITHUB_OUTPUT

	- name: Comment PR
	uses: actions/github-script@v6
	with:
	github-token: ${{secrets.GITHUB_TOKEN}}
	script: \|
	const output = `#### Performance Benchmark Results
	\`\`\`
	${{ steps.benchmark.outputs.BENCHMARK_OUTPUT }}
	\`\`\`
	`;

	github.rest.issues.createComment({
	issue_number: context.issue.number,
	owner: context.repo.owner,
	repo: context.repo.repo,
	body: output
	})

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