chore(ci): use canonical prysm images in local testnet

[montekki]

What ❔

The canonical images after OffchainLabs/prysm#13324 now multiarch, that is including Apple Silicon builds.

Why ❔

Checklist

• PR title corresponds to the body of PR (we generate changelog entries from PRs).
• Tests for the changes have been added / updated.
• Documentation comments have been added / updated.
• Code has been formatted via zk fmt and zk lint.
• Spellcheck has been run via cargo spellcheck --cfg=./spellcheck/era.cfg --code 1.

[prestonvanloon]

Let me know if you have any issues with arm images. The tagged latest image at the time of writing has a manifest that supports arm.

{
   "schemaVersion": 2,
   "mediaType": "application/vnd.oci.image.index.v1+json",
   "manifests": [
      {
         "mediaType": "application/vnd.oci.image.manifest.v1+json",
         "size": 3216,
         "digest": "sha256:9f682cf847794871faba3a2a4126d2e320171da9b9f30c8efcde729dbae69f6d",
         "platform": {
            "os": "linux",
            "architecture": "arm64",
            "variant": "v8"
         }
      },
      {
         "mediaType": "application/vnd.oci.image.manifest.v1+json",
         "size": 3216,
         "digest": "sha256:23ef4cb15611f0d530897b50b53c6ad1564b256b018ce784d07ab236f8efdf12",
         "platform": {
            "os": "linux",
            "architecture": "amd64"
         }
      }
   ]
}

https://console.cloud.google.com/gcr/images/prysmaticlabs/GLOBAL/prysm%2Fbeacon-chain@sha256:ff6922959da35e4c332274f7f211cb0107f41ed84c9fe47aa25ecf36f4e9752e/details?tab=manifest

[montekki]

@prestonvanloon do you think it would be possible to publish these builds also for v4.1.1 (stable) ? Currently they exist only for latest?