Add attest for release image #4

	name: Docker

	on:
	push:
	# Publish semver tags as releases.
	tags: [ 'v..*' ]
	pull_request:
	branches: [ "main" ]

	env:
	IMAGE_NAME: bubylou/steamcmd

	jobs:
	build:
	runs-on: ubuntu-latest
	permissions:
	contents: read
	packages: write
	steps:
	- name: Checkout repository
	uses: actions/checkout@v4

	- name: Setup Docker buildx
	uses: docker/[email protected]

	# Login against a Github registry except on PR
	- name: Log into github container registry
	if: github.event_name != 'pull_request'
	uses: docker/[email protected]
	with:
	registry: ghcr.io
	username: ${{ github.actor }}
	password: ${{ secrets.GITHUB_TOKEN }}

	# Login for Docker registry
	- name: Log into docker container registry
	if: github.event_name != 'pull_request'
	uses: docker/[email protected]
	with:
	registry: docker.io
	username: ${{ vars.DOCKER_USERNAME }}
	password: ${{ secrets.DOCKER_TOKEN }}

	# Build and push Docker image with Bake (don't push on PR)
	- name: Build and push Docker image
	uses: docker/[email protected]
	with:
	push: ${{ github.event_name != 'pull_request' }}
	env:
	TAG: ${{ github.ref_name }}

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