nixos/nix:latest arm64 docker image missing

[adwinying]

Describe the bug

An attempt to pull nixos/nix:latest in an arm64 environment failed, even though it has been working all this time.

/usr/bin/docker buildx build --iidfile /tmp/docker-actions-toolkit-AJ2VQP/iidfile --platform linux/amd64,linux/arm64 --tag ***/devcontainer:0cd0e6f4be926c3b34bbe2c273684c27365dcad5 --tag ***/devcontainer:latest --metadata-file /tmp/docker-actions-toolkit-AJ2VQP/metadata-file --push .
#0 building with "builder-0a3a54ca-83dd-432a-b438-34579911e07c" instance using docker-container driver

#1 [internal] load build definition from Dockerfile
#1 transferring dockerfile: 1.01kB done
#1 DONE 0.0s

#2 [linux/amd64 internal] load metadata for docker.io/nixos/nix:latest
#2 ...

#3 [auth] nixos/nix:pull token for registry-1.docker.io
#3 DONE 0.0s

#4 [linux/arm64 internal] load metadata for docker.io/nixos/nix:latest
#4 ERROR: no match for platform in manifest: not found

#2 [linux/amd64 internal] load metadata for docker.io/nixos/nix:latest
#2 CANCELED
------
 > [linux/arm64 internal] load metadata for docker.io/nixos/nix:latest:
------
Dockerfile:1
--------------------
   1 | >>> FROM nixos/nix
   2 |     
   3 |     ARG TERM
--------------------
ERROR: failed to solve: nixos/nix: failed to resolve source metadata for docker.io/nixos/nix:latest: no match for platform in manifest: not found

Upon further inspection in docker hub the latest tag no longer has an arm64 version:

Steps To Reproduce

Run docker pull nixos/nix:latest in arm64 environment

Expected behavior

Command runs without errors

Additional context

Add any other context about the problem here.

Priorities

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[vcunat]

The docs suggest using ghcr.io/nixos/nix, but doesn't seem helpful here either. Using docker.io/nixos/nix:latest-arm64 does work, but I'm honestly disappointed. (BTW, ghcr.io doesn't have that tag.)

[edolstra]

Fixed with the 2.22.1 release.