Rename package fully to matrix-sygnal #34

	# GitHub actions workflow which builds the docker images.
	# This is useful as it will run in PRs that change the Dockerfile, and can be
	# an early source of warnings that the Dockerfile isn't right.
	# This check also triggers when this file itself is modified.

	name: Check Docker image can be built successfully

	on:
	push:
	paths:
	- 'docker/Dockerfile'
	- '.github/workflows/docker_check.yml'

	permissions:
	contents: read

	jobs:
	build:
	runs-on: ubuntu-latest
	steps:
	- name: Set up QEMU
	id: qemu
	uses: docker/setup-qemu-action@v1
	with:
	platforms: arm64

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

	- name: Inspect builder
	run: docker buildx inspect

	# we explicitly check out the repository (and use `context: .` in buildx)
	# because we need to preserve the git metadata so that setuptools_scm
	# (part of build system config in pyproject.toml) can deduce the package version.
	# See: https://github.com/marketplace/actions/build-and-push-docker-images#path-context
	- name: Checkout
	uses: actions/checkout@v3

	- name: Build all platforms
	uses: docker/build-push-action@v2
	with:
	context: .
	push: false
	labels: "gitsha1=${{ github.sha }}"
	file: "docker/Dockerfile"
	platforms: linux/amd64,linux/arm64

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