anchor.diff:    # Needed for running gollum
     && apk --update add git=$GIT_VERSION \
     # Needed for setcap
  -  libcap=2.26-r0 \
  +  libcap=$LIBCAP_VERSION \
     # cleanup apk cache
     && rm -rf /var/cache/apk/* \
     # Initialize wiki data.
  
positive.code: ARG GIT_TAG
  ARG BUILD_DATE
  # - Sources:
  #   - https://pkgs.alpinelinux.org/packages?name=git&branch=v3.9
  ARG GIT_VERSION=2.20.1-r0
  
  # See https://github.com/opencontainers/image-spec/blob/master/annotations.md
  LABEL org.opencontainers.image.created="${BUILD_DATE}" \
  
negative.code: 
  
  # Declare common ruby base image for all ruby-stages
  FROM ruby:2.6.3-alpine3.10 as gollum-ruby
  
  
  FROM gollum-ruby as gollum-build
  
  # See e.g. https://pkgs.alpinelinux.org/packages?name=icu-dev&branch=v3.10
  ARG ALPINE_SDK_VERSION=1.0-r0
  ARG ICU_DEV_VERSION=64.2-r0
  ARG GOLLUM_VERSION=4.1.4
  
  COPY --from=caddybuild --chown=1000:1000 /dist /dist
  