Add workflow to run benchmarks #1

	name: Benchmark PR

	on:
	pull_request:
	branches: [main]
	push:
	branches: [main]
	env:
	PYTHON_VERSION: "3.10"
	WORKING_DIR: ${{ github.workspace }}/src
	BENCHMARKS_OUTPUT: ${{ github.workspace }}/benchmarks_output

	jobs:
	benchmark-pr:
	runs-on: ubuntu-latest
	defaults:
	run:
	working-directory: ${{ env.WORKING_DIR }}
	steps:
	- name: Checkout repository
	uses: actions/checkout@v3
	with:
	fetch-depth: 0

	- name: Set up Python
	uses: actions/setup-python@v4
	with:
	python-version: ${{ env.PYTHON_VERSION }}

	- name: Install dependencies
	run: \|
	python -m pip install --upgrade pip
	pip install asv virtualenv lf-asv-formatter

	- name: Create ASV machine config file
	run: asv machine --machine gh-runner --yes

	- name: Run Benchmarks - `PR HEAD` vs `main`
	run: \|
	# prepare main branch for comparison
	git remote add upstream https://github.com/${{ github.repository }}.git
	git fetch upstream main

	# Run benchmarks, allow errors, they will be caught in the next step
	asv continuous upstream/main HEAD \
	--no-stats --interleave-rounds -a repeat=3 \|\| true

	- name: BENCHMARK RESULTS
	run: \|
	asv compare --factor=1.1 --no-stats --split upstream/main HEAD \| tee ${{ env.BENCHMARKS_OUTPUT }}
	if grep -q "Benchmarks that have got worse" "${{ env.BENCHMARKS_OUTPUT }}"; then
	echo "Performance degradation detected!"
	exit 1
	fi

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