anchor.diff:    && make bin/containerd-shim \
     && mv bin /out
   
  -FROM tonistiigi/registry:$REGISTRY_VERSION AS registry
  +ARG REGISTRY_VERSION
  +FROM registry:$REGISTRY_VERSION AS registry
   
   FROM gobuild-base AS rootlesskit
   ARG ROOTLESSKIT_VERSION
  
positive.code: 
  FROM --platform=$BUILDPLATFORM alpine AS cni-plugins
  RUN apk add --no-cache curl
  ENV CNI_VERSION=v0.8.1
  ARG TARGETOS
  ARG TARGETARCH
  WORKDIR /opt/cni/bin
  
negative.code: # syntax = docker/dockerfile:1.1-experimental
  
  ARG RUNC_VERSION=v1.0.0-rc10
  ARG CONTAINERD_VERSION=v1.3.2
  # containerd v1.2 for integration tests
  ARG CONTAINERD_OLD_VERSION=v1.2.11
  # available targets: buildkitd, buildkitd.oci_only, buildkitd.containerd_only
  ARG BUILDKIT_TARGET=buildkitd
  ARG REGISTRY_VERSION=2.7.1
  ARG ROOTLESSKIT_VERSION=v0.7.1
  ARG ROOTLESS_BASE_MODE=external
  ARG CNI_VERSION=v0.8.5
  ARG SHADOW_VERSION=4.8.1
  
  # git stage is used for checking out remote repository sources
  FROM --platform=$BUILDPLATFORM alpine AS git
  