anchor.diff:  FROM openresty/openresty:alpine
   
  -RUN apk add --update --no-cache \
  -	bash \
  -	curl \
  -	sudo \
  -	supervisor \
  -	&& rm -rf /var/cache/apk/*
  +RUN set -xe; \
  +	apk add --update --no-cache \
  +		bash \
  +		curl \
  +		sudo \
  +		supervisor \
  +	; \
  +	rm -rf /var/cache/apk/*
   
   RUN set -xe; \
   	addgroup -S nginx; \
  
positive.code: 	mkdir -p /etc/nginx/conf.d
  
  # Generate a self-signed cert
  RUN apk add --no-cache openssl \
  	&& openssl req -batch -x509 -newkey rsa:4086 -days 3650 -nodes -sha256 -subj "/" \
  		-keyout /etc/nginx/server.key -out /etc/nginx/server.crt \
  	&& apk del openssl
  
  COPY conf/nginx/ /etc/nginx/
  COPY conf/sudoers /etc/sudoers
  
negative.code: ARG GOMPLATE_VERSION=2.6.0
  
  # Install docker client binary (if not mounting binary from host)
  RUN set -xe; \
  	curl -sSL -O "https://download.docker.com/linux/static/stable/x86_64/docker-${DOCKER_VERSION}.tgz"; \
  	tar zxf docker-$DOCKER_VERSION.tgz; \
  	mv docker/docker /usr/local/bin ; \
  	rm -rf docker*
  
  # Install docker-gen
  ARG DOCKER_GEN_TARFILE=docker-gen-alpine-linux-amd64-$DOCKER_GEN_VERSION.tar.gz
  RUN set -xe; \
  	curl -sSL -O "https://github.com/jwilder/docker-gen/releases/download/${DOCKER_GEN_VERSION}/${DOCKER_GEN_TARFILE}"; \
  	tar -C /usr/local/bin -xvzf $DOCKER_GEN_TARFILE; \
  	rm $DOCKER_GEN_TARFILE
  
  # Install gomplate
  RUN set -xe; \
  