Fix misinterpretation of absent fields #51

	name: publish-quay
	on:
	push:
	tags:
	- '*'
	workflow_dispatch: {}
	jobs:
	build:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v4
	- name: Get image tags
	id: image_tags
	run: \|
	echo -n "IMAGE_TAGS=${GITHUB_REF#refs/*/}" >> "${GITHUB_OUTPUT}"
	- name: record schema-salad version
	run: pip install setuptools_scm[toml] wheel && python setup.py --version
	- name: Set up Docker Buildx
	uses: docker/setup-buildx-action@v3
	- name: Login to Quay.io
	uses: docker/login-action@v3
	with:
	registry: ${{ secrets.REGISTRY_SERVER }}
	username: ${{ secrets.REGISTRY_USERNAME }}
	password: ${{ secrets.REGISTRY_PASSWORD }}
	- name: Build and publish schema-salad image to Quay
	uses: docker/build-push-action@v5
	with:
	context: .
	file: schema_salad.Dockerfile
	tags: quay.io/commonwl/schema_salad:${{ steps.image_tags.outputs.IMAGE_TAGS }}
	push: true
	cache-from: type=gha
	cache-to: type=gha,mode=max

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