Push to multi-registries

"container": {
  "executor": "@nx-tools/nx-container:build",
  "options": {
    "push": true,
    "tags": [
      "user/app:latest",
      "user/app:1.0.0",
      "ghcr.io/user/app:latest",
      "ghcr.io/user/app:1.0.0"
    ],
  }
}