Update cosign signature message for Readme #13

	name: Create and publish a Docker image

	on:
	push:
	branches: '[6-9].[0-9]'
	env:
	REGISTRY: ghcr.io
	GHCR_IMAGE_NAME: 'exo-docker/exo-community'

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

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

	- name: Log in to the Container registry
	uses: docker/login-action@v2
	with:
	registry: ${{ env.REGISTRY }}
	username: ${{ github.actor }}
	password: ${{ secrets.SWF_TOKEN }}

	- name: Extract metadata (tags, labels) for Docker
	id: metaghcr
	uses: docker/metadata-action@v4
	with:
	images: ${{ env.REGISTRY }}/${{ env.GHCR_IMAGE_NAME }}
	flavor: \|
	latest=false

	- name: Build and push Docker image to ghcr.io
	uses: docker/build-push-action@v4
	id: pushghcr
	with:
	context: .
	push: true
	tags: ${{ steps.metaghcr.outputs.tags }}
	labels: ${{ steps.metaghcr.outputs.labels }}

	- name: Install Cosign
	uses: sigstore/cosign-installer@v3.1.1

	- name: Write signing key to disk
	run: 'echo "$KEY" > cosign.key'
	env:
	KEY: ${{ secrets.COSIGN_PRIVATE_KEY }}

	- name: Sign the published ghcr.io Docker image
	run: cosign sign --yes --key cosign.key "${TAGS}@${DIGEST}"
	env:
	COSIGN_PASSWORD: ${{ secrets.COSIGN_PASSWORD }}
	DIGEST: ${{ steps.pushghcr.outputs.digest }}
	TAGS: ${{ steps.metaghcr.outputs.tags }}

Provide feedback