add testing to readme and pin flask-sqlalchemy #30

	name: Build Docker container on tag

	on:
	push:
	tags:
	- v[0-9]+.[0-9]+.[0-9]+
	- v[0-9]+.[0-9]+.[0-9]+-*

	jobs:
	build:
	name: Build image
	runs-on: ubuntu-20.04

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

	- name: Set env variables
	run: \|
	echo "TAG=${GITHUB_REF/refs\/tags\//}" >> $GITHUB_ENV
	REPO_OWNER=${{ github.repository_owner }}
	echo "IMAGE_NAME=${REPO_OWNER,,}/${GITHUB_REPOSITORY#*/}" >> $GITHUB_ENV

	- name: Login to GitHub Container Registry
	uses: docker/login-action@v1
	with:
	registry: ghcr.io
	username: ${{ github.repository_owner }}
	password: ${{ secrets.GITHUB_TOKEN }}

	- name: Set up QEMU
	uses: docker/setup-qemu-action@v1

	- name: Setup Docker buildx action
	uses: docker/setup-buildx-action@v1

	- name: Run Docker buildx
	run: \|
	docker buildx build \
	--platform linux/amd64,linux/arm64 \
	--tag ghcr.io/$IMAGE_NAME:$TAG \
	--output "type=registry" ./

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