anchor.diff:      --mount=type=cache,target=/go/pkg/mod \
           PREFIX=/build/ ./install.sh $INSTALL_BINARY_NAME
   COPY ./contrib/dockerd-rootless.sh /build
  +
  +FROM djs55/vpnkit@sha256:${VPNKIT_DIGEST} AS vpnkit
   
   # TODO: Some of this is only really needed for testing, it would be nice to split this up
   FROM runtime-dev AS dev
  
positive.code: COPY --from=registry /build/registry* /usr/local/bin/
  COPY --from=criu /build/ /usr/local/
  COPY --from=rootlesskit /build/ /usr/local/bin/
  COPY --from=djs55/vpnkit@sha256:e508a17cfacc8fd39261d5b4e397df2b953690da577e2c987a47630cd0c42f8e /vpnkit /usr/local/bin/vpnkit.x86_64
  
  ENV PATH=/usr/local/cli:$PATH
  ENV DOCKER_BUILDTAGS apparmor seccomp selinux
  
negative.code: ARG CROSS="false"
  ARG GO_VERSION=1.13.1
  ARG DEBIAN_FRONTEND=noninteractive
  ARG VPNKIT_DIGEST=e508a17cfacc8fd39261d5b4e397df2b953690da577e2c987a47630cd0c42f8e
  
  FROM golang:${GO_VERSION}-stretch AS base
  RUN echo 'Binary::apt::APT::Keep-Downloaded-Packages "true";' > /etc/apt/apt.conf.d/keep-cache
  