New example: Load a block-theme from a GH repo, activate it and configure it #134

	name: Has a valid Blueprint.json file?

	on:
	pull_request:

	jobs:
	check_blueprints:
	runs-on: ubuntu-latest

	env:
	GITHUB_BRANCH: ${{ github.event.pull_request.head.ref }}

	steps:
	- name: Checkout code
	uses: actions/checkout@v2

	- name: Fetch trunk
	run: \|
	git fetch origin trunk

	- name: Install pre-requisites
	run: \|
	pip install -r requirements.txt

	- name: Run validate_pr.py
	run: \|
	python validate_pr.py

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