replace n/a with blank space for dsmov to make it clearer #288

	name: Push Docker image
	on:
	push:
	branches:
	- master
	tags:
	- .*
	jobs:
	push_docker_image:
	name: Push Docker image to GitHub Packages
	runs-on: ubuntu-20.04
	steps:
	- name: Check out the repo
	uses: actions/checkout@v2
	- name: Determine tag name
	run: \|
	VERSION=$(echo $GITHUB_REF \| sed -e 's,./$.$,\1,')

	# If we're not tagged in git, tag as latest.
	if [[ "$GITHUB_REF" != "refs/tags/"* ]]; then
	VERSION=latest
	fi

	# Preserve our tag name for later
	echo "tag_name=${VERSION,,}" >> $GITHUB_ENV
	# Use lowercase name of repository, as buildx rejects the name otherwise.
	echo "repository=${GITHUB_REPOSITORY,,}" >> $GITHUB_ENV
	- name: Set up Docker Buildx
	uses: docker/setup-buildx-action@v1
	- name: Cache Docker layers
	uses: actions/cache@v2
	with:
	path: /tmp/.buildx-cache
	key: ${{ runner.os }}-buildx-${{ github.sha }}
	restore-keys: \|
	${{ runner.os }}-buildx-
	- name: Login to GitHub Container Registry
	uses: docker/login-action@v1
	with:
	registry: ghcr.io
	username: ${{ github.actor }}
	password: ${{ secrets.GITHUB_TOKEN }}
	- name: Build and push
	id: docker_build
	uses: docker/build-push-action@v2
	with:
	push: true
	tags: ghcr.io/${{ env.repository }}:${{ env.tag_name }}
	cache-from: type=local,src=/tmp/.buildx-cache
	cache-to: type=local,dest=/tmp/.buildx-cache

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