Update Trivy vulnerability scan format to GitHub and remove image signing step

Author: codebytes

.github/workflows/docker-image.yml

@@ -77,7 +77,9 @@ jobs:
         with:
           image-ref: ${{ fromJSON(steps.build.outputs.metadata)['image.name'] }}
           output: trivy-report.json
-          format: json
+          # format: json
+          format: 'github'
+          github-pat: ${{ github.token }}
           exit-code: 0
 
       - name: Upload Vulnerability Scan Results
@@ -97,17 +99,4 @@ jobs:
           labels: ${{ steps.meta.outputs.labels }}
           cache-from: type=gha
           cache-to: type=gha,mode=max
-        # Sign the resulting Docker image digest except on PRs.
-      # This will only write to the public Rekor transparency log when the Docker
-      # repository is public to avoid leaking data.  If you would like to publish
-      # transparency data even for private images, pass --force to cosign below.
-      # https://github.com/sigstore/cosign
-      - name: Sign the published Docker image
-        if: ${{ github.event_name != 'pull_request' }}
-        env:
-          # https://docs.github.com/en/actions/security-guides/security-hardening-for-github-actions#using-an-intermediate-environment-variable
-          TAGS: ${{ steps.meta.outputs.tags }}
-          DIGEST: ${{ steps.build-and-push.outputs.digest }}
-        # This step uses the identity token to provision an ephemeral certificate
-        # against the sigstore community Fulcio instance.
-        run: echo "${TAGS}" | xargs -I {} cosign sign --yes {}@${DIGEST}
+