Add judge balancer #3655

	name: build
	on: [push, pull_request]
	jobs:
	lint:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v3
	- name: Set up Python 3.11
	uses: actions/setup-python@v4
	with:
	python-version: '3.11'
	- name: Install flake8
	run: pip install flake8 flake8-import-order flake8-future-import flake8-commas flake8-logging-format flake8-quotes
	- name: Lint with flake8
	run: \|
	flake8 --version
	flake8
	unit:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v3
	- name: Set up Python 3.11
	uses: actions/setup-python@v4
	with:
	python-version: '3.11'
	- name: Cache pip
	uses: actions/cache@v2
	with:
	path: ~/.cache/pip
	key: pip-${{ runner.os }}-${{ secrets.CACHE_VERSION }}-${{ hashFiles('requirements.txt') }}
	- name: Install unit test dependencies
	run: \|
	pip install wheel
	pip install -r requirements.txt
	pip install coverage
	cp .ci.settings.py dmoj/local_settings.py
	- name: Start MySQL
	run: sudo systemctl start mysql.service
	- name: Run unit tests
	run: coverage run --source=. manage.py test judge
	- name: Generate coverage report
	run: coverage xml
	styles:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v3
	- name: Install Node.js
	uses: actions/setup-node@v3
	with:
	node-version: '18.x'
	- name: Install npm packages
	run: npm ci
	- name: Build style.css
	run: ./make_style.sh

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