Add save handler for Panel Layout Builder #153

	name: tests

	on:
	push:
	branches:
	- main
	pull_request:
	branches:
	- '*'
	workflow_dispatch:
	schedule:
	- cron: '0 7 * * SUN'

	jobs:
	test:
	runs-on: ubuntu-latest
	strategy:
	fail-fast: false
	matrix:
	python-version: ['3.8', '3.9', '3.10', '3.11']
	steps:
	- name: Checkout
	uses: actions/checkout@v3
	- name: Base Setup
	uses: jupyterlab/maintainer-tools/.github/actions/base-setup@v1
	- name: Install dependencies
	run: \|
	python -m pip install --upgrade pip
	python -m pip install "jupyterlab~=4.0" "wheel"
	- name: Build the extension
	run: \|
	python -m pip install ".[tests]"
	- name: Check extension
	run: \|
	jupyter labextension list 2>&1 \| grep -ie "jupyterlab_pyviz.*OK"
	python -m jupyterlab.browser_check
	- name: Run tests
	run: \|
	python -m pytest pyviz_comms

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