anchor.diff:  		77984A986EBC2AA786BC0F66B01FBB92821C587A \
   		8FCCA13FEF1D0C2E91008E09770F7A9A5AE15600 \
   	; do \
  -		http_proxy= gpg --keyserver hkp://ipv4.pool.sks-keyservers.net:80 --recv-keys "${key}"; \
  +		for server in $(shuf -e ${GPG_SERVERS}) ; do \
  +			http_proxy= gpg --keyserver "$server" --recv-keys "${key}" && break || : ; \
  +		done ; \
   	done && \
   	curl -fSLO "https://nodejs.org/dist/v${NODE_VERSION}/node-v${NODE_VERSION}-linux-${ARCH}.tar.xz" && \
   	curl -fSLO "https://nodejs.org/dist/v${NODE_VERSION}/SHASUMS256.txt.asc" && \
  
positive.code: # install tini
  RUN \
  	TINI_VERSION=v0.18.0 && \
  	http_proxy='' gpg --keyserver ipv4.pool.sks-keyservers.net --recv-keys 0527A9B7 && \
  	wget -O/usr/bin/tini     "https://github.com/krallin/tini/releases/download/${TINI_VERSION}/tini" && \
  	wget -O/usr/bin/tini.asc "https://github.com/krallin/tini/releases/download/${TINI_VERSION}/tini.asc" && \
  	gpg --verify /usr/bin/tini.asc && \
  
negative.code: # install gosu
  RUN \
  	GOSU_VERSION=1.11 && \
  	for server in $(shuf -e ${GPG_SERVERS}); do \
  		http_proxy= gpg --keyserver "$server" --recv-keys B42F6819007F00F88E364FD4036A9C25BF357DD4 && break || : ; \
  	done && \
  	wget -O/usr/bin/gosu     "https://github.com/tianon/gosu/releases/download/${GOSU_VERSION}/gosu-amd64" && \
  	wget -O/usr/bin/gosu.asc "https://github.com/tianon/gosu/releases/download/${GOSU_VERSION}/gosu-amd64.asc" && \
  	gpg --verify /usr/bin/gosu.asc && \
  