fix: disable SBOM upload to immutable GitHub release (#247)

Author: anasstahr

.github/workflows/ecr-publish-on-release.yml

@@ -63,6 +63,7 @@ jobs:
           image: mcp-proxy-for-aws:${{ steps.get-package-version.outputs.version }}
           format: cyclonedx-json
           output-file: sbom.cyclonedx.json
+          upload-release-assets: false
 
       - name: Install CycloneDX CLI
         run: |