anchor.diff: -FROM alpine:edge
  +# Multi-Stage build - https://goo.gl/qejG4w
  +FROM golang:1.9-alpine as confd
  +
  +ARG CONFD_VERSION=0.14.0
  +
  +ADD https://github.com/kelseyhightower/confd/archive/v${CONFD_VERSION}.tar.gz /tmp/
  +
  +RUN \
  +  apk add --no-cache \
  +    bzip2 \
  +    make && \
  +  \
  +  mkdir -p /go/src/github.com/kelseyhightower/confd && \
  +  cd /go/src/github.com/kelseyhightower/confd && \
  +  tar --strip-components=1 -zxf /tmp/v${CONFD_VERSION}.tar.gz && \
  +  \
  +  go install github.com/kelseyhightower/confd && \
  +  \
  +  rm -rf /tmp/v${CONFD_VERSION}.tar.gz
  +
  +
  +FROM alpine:3.6
   
   ARG TOR_VERSION=0.3.0.11
  +ARG BUILD_DATE
  +ARG VCS_REF
   
   # Build-time metadata as defined at http://label-schema.org
  -ARG BUILD_DATE
  -ARG VCS_REF
   LABEL org.label-schema.build-date=$BUILD_DATE \
     org.label-schema.name="docker-tor" \
     org.label-schema.description="Simple docker container for a tor node" \
  
positive.code:     build-base \
      ca-certificates \
      gnupg \
      libcap-dev \
      libevent-dev \
      libressl-dev \
  
negative.code:   org.label-schema.version=$TOR_VERSION \
    org.label-schema.schema-version="1.0"
  
  COPY --from=confd /go/bin/confd /usr/bin/confd
  ADD https://www.torproject.org/dist/tor-${TOR_VERSION}.tar.gz /tmp/
  ADD https://www.torproject.org/dist/tor-${TOR_VERSION}.tar.gz.asc /tmp/
  
  WORKDIR /tmp
  RUN \
    apk add --update \
      libcap \
      libevent \
      su-exec \
  