anchor.diff:  ENV NGINX_MAX_UPLOAD_SIZE 50g
   #ENV YARN_VERSION 1.3.2-1
   #ENV YARN_VERSION 1.7.0-1
  -ENV YARN_VERSION 1.9.4-1
  +#ENV YARN_VERSION 1.9.4-1 # for 2018-10-27.23
   #ENV YARN_VERSION 1.10.1-1
  -ENV CANVAS_RELEASE release/2018-10-27.23
  +ENV YARN_VERSION 1.12.3-1
  +ENV CANVAS_RELEASE release/2019-05-11.43
  +#ENV CANVAS_RELEASE release/2018-10-27.23
   #ENV CANVAS_RELEASE release/2018-11-17.24
   
   # Work around github.com/zertosh/v8-compile-cache/issues/2
  
positive.code: FROM instructure/ruby-passenger:2.4
  #FROM instructure/ruby-passenger:2.4
  ##FROM instructure/canvas-lms:stable
  
  LABEL maintainer="Ray Pulsipher <ray@cmagic.biz>"
  LABEL description="Canvas LMS by Instructure - Image for Open Prison Education"
  LABEL vendor="openprisoneducation.com"
  LABEL version="0.8"
  
  # ope-canvas - Canvas LMS System
  # Build with docker build -t ope-canvas .
  
negative.code: 
  RUN mkdir -p .yardoc \
               app/stylesheets/brandable_css_brands \
               app/views/info \
               client_apps/canvas_quizzes/dist \
               client_apps/canvas_quizzes/node_modules \
               client_apps/canvas_quizzes/tmp \
               config/locales/generated \
               gems/canvas_i18nliner/node_modules \
               gems/selinimum/node_modules \
               log \
               node_modules \
               packages/canvas-planner/lib \
               packages/canvas-planner/node_modules \
               pacts \
               public/dist \
               public/doc/api \
               public/javascripts/client_apps \
               public/javascripts/compiled \
               public/javascripts/translations \
               reports \
               tmp \
               /home/docker/.bundler/ \
               /home/docker/.cache/yarn \
  