Add xlabel to PlotElement. #3060

	name: ci

	on:
	pull_request:
	branches:
	- main
	push:
	branches:
	- main

	jobs:
	test-ubuntu:
	name: "pytest_${{ matrix.suffix }} on ${{ matrix.python-version }} on ubuntu-latest"
	runs-on: ubuntu-latest
	strategy:
	fail-fast: false
	matrix:
	python-version: ["3.10"] # 3.x disabled b/c of 3.11 grpcio-tools build fail.
	suffix: ["core", "benchmarks", "algorithms", "clients", "pyglove", "raytune"]
	include:
	- suffix: "clients"
	python-version: "3.8"
	- suffix: "clients"
	python-version: "3.9"
	- suffix: "clients"
	python-version: "3.10"
	steps:
	- name: Clone repo
	uses: actions/checkout@v3.5.2
	- name: Set up Python ${{ matrix.python-version }}
	uses: actions/setup-python@v4
	with:
	# Cache pip packages.
	python-version: ${{ matrix.python-version }}
	cache: 'pip'
	cache-dependency-path: '**/requirements.txt'
	- name: Cache dependencies (for faster installation)
	# This was taken from: https://github.com/actions/setup-python/issues/330#issuecomment-1500667578
	uses: actions/cache@v3.3.1
	id: cache
	with:
	path: ${{ env.pythonLocation }}
	key: >-
	${{ env.pythonLocation }}
	${{ hashFiles('*/requirements.txt') }}
	- name: Install essential dependencies
	run: \|
	sudo apt-get install -y libprotobuf-dev
	python -m pip install --upgrade pip setuptools
	pip install wheel
	pip install grpcio-tools==1.48.2
	pip install pytest pytest-xdist
	pip wheel -e .
	pip install -e .
	pip install -r requirements-test.txt
	- name: Print installed dependencies
	run: pip list
	- name: Install test-specific dependencies and run test
	# TODO: Split install and run.
	run: bash run_tests.sh ${{ matrix.suffix }}

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