└ $ skopeo inspect --raw docker://ghcr.io/llm-d/llm-d-cuda-dev:pr-230          
{
  "schemaVersion": 2,
  "mediaType": "application/vnd.oci.image.index.v1+json",
  "manifests": [
    {
      "mediaType": "application/vnd.oci.image.manifest.v1+json",
      "digest": "sha256:0298f7c3ceec45da42b10f52b8edd4c5ebe5edb8011d62b8e5d66fef749ce124",
      "size": 5436,
      "platform": {
        "architecture": "amd64",
        "os": "linux"
      }
    },
    {
      "mediaType": "application/vnd.oci.image.manifest.v1+json",
      "digest": "sha256:6eba444dd58a8748225335c4dcc53232c53d8252370f4a01ecfa6e692925db73",
      "size": 568,
      "annotations": {
        "vnd.docker.reference.digest": "sha256:0298f7c3ceec45da42b10f52b8edd4c5ebe5edb8011d62b8e5d66fef749ce124",
        "vnd.docker.reference.type": "attestation-manifest"
      },
      "platform": {
        "architecture": "unknown",
        "os": "unknown"
      }

Set the supported architectures to {amd64, unknown}