anchor.diff:  
   EXPOSE     587
   CMD        [ "/bin/sh", "-c", "/scripts/run.sh" ]
  +
  
positive.code: ARG SASL_XOAUTH2_REPO_URL=https://github.com/tarickb/sasl-xoauth2.git
  ARG SASL_XOAUTH2_GIT_REF=release-0.12
  
  RUN        --mount=type=cache,target=/var/cache/apt,sharing=locked,id=var-cache-apt-$TARGETPLATFORM \
             --mount=type=cache,target=/var/lib/apt,sharing=locked,id=var-lib-apt-$TARGETPLATFORM \
             --mount=type=cache,target=/var/cache/apk,sharing=locked,id=var-cache-apk-$TARGETPLATFORM \
             --mount=type=cache,target=/etc/apk/cache,sharing=locked,id=etc-apk-cache-$TARGETPLATFORM \
             --mount=type=tmpfs,target=/tmp \
             --mount=type=tmpfs,target=/sasl-xoauth2 \
             --mount=type=bind,from=build-scripts,source=/build-scripts,target=/build-scripts \
  
negative.code: # Install supervisor, postfix
  # Install postfix first to get the first account (101)
  # Install opendkim second to get the second account (102)
  #           --mount=type=cache,target=/var/cache/apk,sharing=locked,id=var-cache-apk-$TARGETPLATFORM \
  #           --mount=type=cache,target=/etc/apk/cache,sharing=locked,id=etc-apk-cache-$TARGETPLATFORM \
  RUN        --mount=type=cache,target=/var/cache/apt,sharing=locked,id=var-cache-apt-$TARGETPLATFORM \
             --mount=type=cache,target=/var/lib/apt,sharing=locked,id=var-lib-apt-$TARGETPLATFORM \
             --mount=type=tmpfs,target=/var/cache/apk \
             --mount=type=tmpfs,target=/tmp \
             --mount=type=bind,from=build-scripts,source=/build-scripts,target=/build-scripts \
             sh /build-scripts/postfix-install.sh
  