Add setup buildx step to dev-container workflow #25

	name: 'devcontainer CI'
	on:
	workflow_dispatch:
	pull_request:
	branches:
	- main
	push:
	branches:
	- main

	jobs:
	build_devcontainer:
	runs-on: ubuntu-latest
	steps:
	- name: Free Disk Space (Ubuntu)
	uses: jlumbroso/free-disk-space@54081f138730dfa15788a46383842cd2f914a1be
	with:
	# this might remove tools that are actually needed,
	# if set to "true" but frees about 6 GB
	tool-cache: false

	# all of these default to true, but feel free to set to
	# "false" if necessary for your workflow
	android: true
	dotnet: true
	haskell: true
	large-packages: true
	docker-images: true
	swap-storage: true
	- name: Checkout from github
	uses: actions/checkout@v3
	- name: extract the github reference
	run: echo "BRANCH=${GITHUB_REF##*/}" >> $GITHUB_ENV
	- name: "image name from repo name"
	id: docker_image_name
	run: echo "docker_image=${{ github.repository }}" \| tr '[:upper:]' '[:lower:]' \|sed 's/[^0-9,a-z,A-Z,=,_,\/]/-/g' >>${GITHUB_OUTPUT}
	- name: setup buildx
	uses: docker/setup-buildx-action@v2
	- name: Build and run dev container task
	uses: devcontainers/ci@v0.3
	with:
	imageName: devcontainer/${{ steps.docker_image_name.outputs.docker_image }}
	configFile: ./.devcontainer/devcontainer.json
	push: never
	cacheFrom: type=gha
	cacheTo: type=gha,mode=max

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