anchor.diff:  # https://www.google.com/linuxrepositories/
   	gpg --batch --keyserver ha.pool.sks-keyservers.net --recv-keys 'EB4C 1BFD 4F04 2F6D DDCC EC91 7721 F63B D38B 4796'; \
   	gpg --batch --verify go.tgz.asc go.tgz; \
  +	gpgconf --kill all; \
   	rm -rf "$GNUPGHOME" go.tgz.asc; \
   	\
   	tar -C /usr/local -xzf go.tgz; \
  
positive.code: 
  ENV PATH /usr/local/go/bin:$PATH
  
  ENV GOLANG_VERSION 1.15.3
  
  RUN set -eux; \
  	apk add --no-cache --virtual .build-deps \
  
negative.code: FROM node:lts-alpine3.13
  
  RUN apk add --no-cache \
  		ca-certificates
  