anchor.diff:      wget \
       zlib-dev && \
     \
  +  wget --no-verbose https://www.torproject.org/dist/tor-${TOR_VERSION}.tar.gz && \
  +  wget --no-verbose https://www.torproject.org/dist/tor-${TOR_VERSION}.tar.gz.asc && \
     gpg --keyserver ipv4.pool.sks-keyservers.net --recv-keys \
       0x6AFEE6D49E92B601 \
       0x28988BF5 \
  
positive.code: 
  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 && \
  
negative.code:   org.label-schema.schema-version="1.0"
  
  COPY --from=confd /go/bin/confd /usr/bin/confd
  
  WORKDIR /tmp
  RUN \
  