synapser refactor phase a #212

	name: Docker

	# Run on pushes to main and develop,
	# and on PRs to develop
	# On pushed tags, also build and tag image with tag
	on:
	push:
	branches:
	- main
	- develop
	tags: [ 'v*' ]
	pull_request:
	branches: [ develop ]

	# Use ghcr registry
	env:
	REGISTRY: ghcr.io
	# github.repository as <account>/<repo>
	IMAGE_NAME: ${{ github.repository }}


	jobs:
	build:
	runs-on: ubuntu-latest
	if: ${{ !github.event.pull_request.draft }}
	permissions:
	contents: read
	packages: write

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

	# Login against a Docker registry except on PR
	# (confirm that image can be built, but don't push to registry)
	# https://github.com/docker/login-action
	- name: Log into registry ${{ env.REGISTRY }}
	if: github.event_name != 'pull_request'
	uses: docker/login-action@28218f9b04b4f3f62068d7b6ce6ca5b26e35336c
	with:
	registry: ${{ env.REGISTRY }}
	username: ${{ github.actor }}
	password: ${{ secrets.GITHUB_TOKEN }}

	# Extract metadata (tags, labels) for Docker
	# https://github.com/docker/metadata-action
	- name: Extract Docker metadata
	id: meta
	uses: docker/metadata-action@v3
	with:
	images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}

	- name: Set up Docker Buildx
	uses: docker/setup-buildx-action@v1

	# Build and push Docker image with Buildx (don't push on PR)
	# https://github.com/docker/build-push-action
	- name: Build and push Docker image
	uses: docker/build-push-action@v2
	with:
	context: .
	push: ${{ github.event_name != 'pull_request' }}
	tags: ${{ steps.meta.outputs.tags }}
	platforms: linux/amd64

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