Update from https://github.com/opengisch/teaching-and-talks/commit/fd… #215

	name: Staging

	on:
	push:
	branches:
	- staging
	pull_request:
	branches:
	- staging

	env:
	BUILD: ./build
	INDEX: ./build/index.html

	jobs:
	update_index_push_to_prod:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v3

	# Check for './build' and './build/index.html'
	# Flatten directories
	# Cleanup
	# Push to production

	- name: 🧐 Check for build
	run: \|
	# ------------
	# Ensure files
	# ------------

	declare -a missing

	if ! [[ -d "$BUILD" ]]; then
	missing+=("build")
	fi

	if ! [[ -f "$INDEX" ]]; then
	missing+=("build/index.html")
	fi

	if ! [[ ${#missing[*]} -eq 0 ]]
	then
	echo "::error ::Missing files from 'staging' branch."
	echo "Missing: ${missing[*]}"
	exit 1
	else
	exit 0
	fi

	- name: Unpack subfolders to improve page navigation
	run: mv $BUILD/* .

	- name: 🧹 Cleanup
	run: rmdir $BUILD

	- name: Create .nojekyll file to avoid problems with CSS
	run: touch .nojekyll

	- name: 🚠 Push to production
	uses: EndBug/add-and-commit@v9
	with:
	message: Deploying build
	add: '.'
	push: origin HEAD:production --force

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