anchor.diff:  # 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=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=/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
  
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: 
  EXPOSE     587
  CMD        [ "/bin/sh", "-c", "/scripts/run.sh" ]
  
  