anchor.diff:  FROM alpine:edge as boringssl-builder
   RUN apk update && apk add cmake gcc g++ git go ninja perl
   RUN mkdir /usr/src && git clone https://boringssl.googlesource.com/boringssl /usr/src/boringssl \
  - && cd /usr/src/boringssl && git reset --hard ba8f1864c15ec938ce0851f416663511c89f454a
  + && cd /usr/src/boringssl && git reset --hard d8dbde79f9803c4cfce11eadfd49ca1284b49734
   WORKDIR /usr/src/boringssl
   COPY boringssl-*.patch /usr/src/
   RUN git -c user.name=builder -c user.email=builder@docker.invalid am /usr/src/boringssl-*.patch
  
positive.code: 
  FROM alpine:edge as nginx-builder
  RUN apk update && apk add coreutils curl findutils gcc git gnupg luajit-dev make musl-dev pcre-dev zlib-dev
  ENV NGINX_VERSION="1.13.6"
  WORKDIR /usr/src
  RUN curl -sSL -O "https://nginx.org/download/nginx-$NGINX_VERSION.tar.gz" \
                -O "https://nginx.org/download/nginx-$NGINX_VERSION.tar.gz.asc"
  
negative.code: RUN git clone https://github.com/simpl/ngx_devel_kit && cd ngx_devel_kit \
   && git reset --hard e443262071e759c047492be60ec7e2d73c5b57ec # v0.3.0
  RUN git clone https://github.com/openresty/lua-nginx-module && cd lua-nginx-module \
   && git reset --hard 7c7b2e0b1100cd96877c2d1612b572a651b91ae9 # v0.10.12rc1
  RUN cd lua-nginx-module \
   && git -c user.name=builder -c user.email=builder@docker.invalid am /usr/src/lua-nginx-module-*.patch
  WORKDIR /usr/src/nginx-$NGINX_VERSION
  