add difficulty option for subtasks #9

	name: Build and publish container

	on:
	release:
	types: [published]
	push:
	branches:
	- main
	- master

	jobs:
	docker-img:
	runs-on: ubuntu-latest

	steps:
	- name: checkout
	uses: actions/checkout@v3

	- name: Set up QEMU
	uses: docker/setup-qemu-action@v2

	- name: Set up Docker Buildx
	id: buildx
	uses: docker/setup-buildx-action@v2

	- name: Log-in to ghcr.io
	run: echo "${{ secrets.GITHUB_TOKEN }}" \| docker login https://ghcr.io -u ${{ github.actor }} --password-stdin

	- name: Build and push container image
	run: \|
	IMAGE_ID=$(echo ghcr.io/${{ github.repository }} \| tr '[A-Z]' '[a-z]')

	# Strip git ref prefix from version
	VERSION=$(echo "${{ github.ref }}" \| sed -e 's,./$.$,\1,')
	# Strip "v" prefix from tag name
	[[ "${{ github.ref }}" == "refs/tags/"* ]] && VERSION=$(echo $VERSION \| sed -e 's/^v//')
	# when the branch is master, replace master with latest
	[ "$VERSION" == "master" ] && VERSION=latest

	echo IMAGE_ID=$IMAGE_ID
	echo VERSION=$VERSION

	# Build and Publish container image
	docker buildx build --push \
	--tag $IMAGE_ID:$VERSION \
	--build-arg CHECKOUT=${{ github.ref }} \
	--build-arg VERSION=$VERSION \
	--platform linux/amd64 .

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