refactor(CD): simplify task #5

	name: Publish Docker Image

	on:
	push:
	branches:
	- main
	workflow_dispatch: # Manual trigger

	jobs:
	build:
	runs-on: ubuntu-latest

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

	- name: Set up JDK 21
	uses: actions/setup-java@v3
	with:
	distribution: 'adopt'
	java-version: '21'

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

	- name: Log in to GitHub Container Registry
	uses: docker/login-action@v2
	with:
	registry: ghcr.io
	username: ${{ github.actor }}
	password: ${{ secrets.GITHUB_TOKEN }}

	- name: Determine Image Tag
	id: tag
	run: \|
	# Try to find a Git tag, otherwise use the short commit hash
	TAG=$(git describe --tags --exact-match 2>/dev/null \|\| git rev-parse --short HEAD)
	echo "Tag or Commit: $TAG"
	echo "::set-output name=image_tag::$TAG"

	- name: Build and Publish Docker Image
	run: \|
	./backend/gradlew bootBuildImage --imageName=ghcr.io/${{ github.repository }}:${{ steps.tag.outputs.image_tag }}
	./backend/gradlew bootBuildImage --imageName=ghcr.io/${{ github.repository }}:latest

	- name: Verify image
	run: docker images

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