Update How to use to explain how to build and run the dockers locally #290

	name: Run tests

	on: [push, pull_request]

	jobs:
	build:

	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v2
	- name: Set up Python ${{ matrix.python-version }}
	uses: actions/setup-python@v2
	with:
	python-version: 3.8
	- name: Install dependencies
	run: pip install -r requirements.txt
	- name: Run tests
	run: nosetests

	get_json_versions:
	runs-on: ubuntu-latest
	steps:
	# Fetch versions to work for images
	- uses: actions/checkout@v2
	- name: Set up Python 3.8
	uses: actions/setup-python@v2
	with:
	python-version: 3.8
	- id: set-versions
	run: echo "::set-output name=versions::$(./get_json_versions.py)"

	outputs:
	versions: ${{ steps.set-versions.outputs.versions }}

	build_images:
	runs-on: ubuntu-latest
	needs: get_json_versions
	strategy:
	fail-fast: false
	matrix:
	ps-version: ${{ fromJson(needs.get_json_versions.outputs.versions) }}
	steps:
	- uses: actions/checkout@v2
	- name: Build Docker image
	run: docker build images/${version}

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