templates publish should support aarch64

[elibroftw]

I use the devcontainers action which calls the devcontainers cli to publish all templates at once. I want to support multiple platforms (aarch64 and amd64).

I might follow https://github.com/devcontainers/images/tree/main/build#build-and-image-generation-for-devcontainers but it looks like a PITA

Some basic research

Create a Manifest List?

dotnet:dev-8.0-noble

elijahlopez@Elijahs-MacBook-Air ~ % docker manifest inspect mcr.microsoft.com/devcontainers/dotnet:dev-8.0-noble
{
   "schemaVersion": 2,
   "mediaType": "application/vnd.oci.image.index.v1+json",
   "manifests": [
      {
         "mediaType": "application/vnd.oci.image.manifest.v1+json",
         "size": 3539,
         "digest": "sha256:299d0161335b3bc467ee75adf5320ba0a445ca1d7889da4e7501b131874e1938",
         "platform": {
            "architecture": "amd64",
            "os": "linux"
         }
      },
      {
         "mediaType": "application/vnd.oci.image.manifest.v1+json",
         "size": 3539,
         "digest": "sha256:62420e64f8017becb09e900c600289aa2891e5eb74e20b59cdc0b03be7fd0f6f",
         "platform": {
            "architecture": "arm64",
            "os": "linux"
         }
      },
      {
         "mediaType": "application/vnd.oci.image.manifest.v1+json",
         "size": 566,
         "digest": "sha256:cfd659bb481152e24aa8b94536ccb958b4f11ef6e7dd835da07650ae0e1f465a",
         "platform": {
            "architecture": "unknown",
            "os": "unknown"
         }
      },
      {
         "mediaType": "application/vnd.oci.image.manifest.v1+json",
         "size": 566,
         "digest": "sha256:731eb3afb5f172ba96e84f3943baece9836b3baee5a46d64b1b49622a36c9206",
         "platform": {
            "architecture": "unknown",
            "os": "unknown"
         }
      }
   ]
}