Update rationale.md #160

	name: workshop notebooks

	on:
	push:
	branches:
	- '20*'
	- '!master'


	jobs:
	build:

	runs-on: ubuntu-latest

	steps:
	- name: Checkout phoebe2-workshop (current branch)
	uses: actions/checkout@v2
	with:
	path: phoebe2-workshop-branch

	- name: Checkout phoebe2-workshop master
	uses: actions/checkout@v2
	with:
	repository: phoebe-project/phoebe2-workshop
	ref: master
	path: phoebe2-workshop-master

	- name: Set up Python 3.9
	uses: actions/setup-python@v2
	with:
	python-version: 3.9

	- name: Install pip requirements
	run: \|
	python -m pip install --upgrade pip
	pip install jupyter

	- name: Set branch env var
	run: \|
	echo "branch=`echo ${{ github.ref }} \| cut -d "/" -f 3`" >> $GITHUB_ENV

	- name: Build notebooks
	run: \|
	cd phoebe2-workshop-branch
	mkdir -p ../phoebe2-workshop-master/${{ env.branch }}
	jupyter nbconvert --to python ./*ipynb --output-dir=../phoebe2-workshop-master/${{ env.branch }}
	cp ./*ipynb ../phoebe2-workshop-master/${{ env.branch }}/
	cd ../phoebe2-workshop-master

	- name: Commit to master branch
	run: \|
	cd phoebe2-workshop-master
	git config --global user.email "gh-actions"
	git config --global user.name "gh-actions"
	git config -l \| grep 'http\..*\.extraheader' \| cut -d= -f1 \| xargs -L1 git config --unset-all
	git add ${{ env.branch }}/*
	git diff-index --quiet HEAD \|\| git commit -m "building ${{ env.branch }} notebooks" -m "automatically generated by github build-docs action"
	git push -q -f https://kecnry:${{ secrets.GH_API_KEY }}@github.com/phoebe-project/phoebe2-workshop master

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