fix greatest/least usage #568

	# This workflow uses actions that are not certified by GitHub.
	# They are provided by a third-party and are governed by
	# separate terms of service, privacy policy, and support
	# documentation.

	name: Create and publish a backend image of specified branches

	on:
	push:
	branches:
	- develop
	- master
	- release
	- staging/**

	env:
	REGISTRY: ghcr.io
	IMAGE_NAME: ${{ github.repository }}-backend

	jobs:
	build-and-push-image-and-clean-ghcr:
	runs-on: ubuntu-latest
	permissions:
	contents: read
	packages: write

	steps:
	- name: Checkout repository
	uses: actions/checkout@v3
	with:
	# Fetch all tags
	fetch-depth: 0
	- name: Log in to the Container registry
	uses: docker/login-action@f054a8b539a109f9f41c372932f1ae047eff08c9
	with:
	registry: ${{ env.REGISTRY }}
	username: ${{ github.actor }}
	password: ${{ secrets.GITHUB_TOKEN }}

	- name: Extract metadata (tags, labels) for Docker
	id: meta
	uses: docker/metadata-action@98669ae865ea3cffbcbaa878cf57c20bbf1c6c38
	with:
	images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
	tags: type=raw,value={{branch}}

	- name: Build and push Docker image
	uses: docker/build-push-action@ad44023a93711e3deb337508980b4b5e9bcdc5dc
	with:
	context: .
	file: backend.Dockerfile
	push: true
	tags: ${{ steps.meta.outputs.tags }}
	labels: ${{ steps.meta.outputs.labels }}

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