Update CONTRIBUTING.md #362

	name: Jupyter Notebooks CI
	on: [push, pull_request]
	jobs:
	Check-Notebooks:
	runs-on: ubuntu-latest
	defaults:
	run:
	shell: bash -el {0}
	steps:
	- name: check out repository code
	uses: actions/checkout@v3
	- name: set up conda environment
	uses: conda-incubator/setup-miniconda@v2
	with:
	miniforge-version: latest
	miniforge-variant: mambaforge
	channel-priority: strict
	channels: conda-forge
	show-channel-urls: true
	use-only-tar-bz2: true
	auto-update-conda: true
	auto-activate-base: false
	activate-environment: notebook-env
	- name: Install tobac dependencies
	run: \|
	mamba install -c conda-forge --yes ffmpeg gcc jupyter pytables
	mamba install -c conda-forge --yes --file example_requirements.txt
	- name: Install tobac
	run: \|
	pip install .
	- name: Find all notebook files
	run: \|
	find . -type f -name '*.ipynb' > nbfiles.txt
	cat nbfiles.txt
	- name: Execute all notebook files
	run: \|
	while IFS= read -r nbpath; do
	jupyter nbconvert --inplace --ClearMetadataPreprocessor.enabled=True --clear-output $nbpath
	jupyter nbconvert --to notebook --inplace --execute $nbpath
	done < nbfiles.txt

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