FWIW Google Container Registry (GCR) allows arbitrarily nested paths. Part of the difficulty though is that the Docker Registry V2 API more or less assumes the

FWIW Google Container Registry (GCR) allows arbitrarily nested paths. Part of the difficulty though is that the Docker Registry V2 API more or less assumes the two-level namespacing. Technically GCR might be considered to be in violation of the spec. I just wish everyone was.