don't return certifier info if it is not configured #1282

	name: Docker Build and Push

	on:
	push:
	branches: ["develop"]
	pull_request:
	branches: ["develop"]
	release:
	types: [published]

	jobs:
	docker-build:
	runs-on: ubuntu-22.04
	steps:
	- name: Git Checkout
	uses: actions/checkout@v4
	- name: Find tag
	id: tagger
	run: \|
	echo "tag=$(git fetch --prune --unshallow && git describe --tags --match 'v*')" >> $GITHUB_OUTPUT

	- name: Show docker image tag
	run: \|
	echo 'Building spacemeshos/poet:${{steps.tagger.outputs.tag}} docker image'

	- name: Set up Docker Buildx
	uses: docker/setup-buildx-action@v3

	- name: Login to DockerHub
	uses: docker/login-action@v3
	with:
	username: ${{ secrets.DOCKERHUB_USERNAME }}
	password: ${{ secrets.DOCKERHUB_TOKEN }}

	- name: Build and push
	uses: docker/build-push-action@v6
	with:
	context: .
	push: true
	tags: spacemeshos/poet:latest, spacemeshos/poet:${{ GITHUB.SHA }}, spacemeshos/poet:${{steps.tagger.outputs.tag}}
	build-args: \|
	version=${{steps.tagger.outputs.tag}}

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