anchor.diff:  
   # Add user so we don't need --no-sandbox.
   RUN addgroup -S pptruser && adduser -S -g pptruser pptruser \
  -    && mkdir -p /home/pptruser/Downloads \
  +    && mkdir -p /home/pptruser/Downloads /app \
       && chown -R pptruser:pptruser /home/pptruser \
  -    && chown -R pptruser:pptruser /app \
  -    && chown -R pptruser:pptruser /tmp
  +    && chown -R pptruser:pptruser /app
   
   # Run everything after as non-privileged user.
   USER pptruser
  
positive.code:     echo @edge http://nl.alpinelinux.org/alpine/edge/main >> /etc/apk/repositories && \
      apk add --no-cache \
        chromium@edge \
        nss@edge
  
  # Tell Puppeteer to skip installing Chrome. We'll be using the installed package.
  ENV PUPPETEER_SKIP_CHROMIUM_DOWNLOAD true
  
  RUN npm install puppeteer
  
  
negative.code: FROM node:12-alpine
  
  # Installs latest Chromium (63) package.
  RUN apk update && apk upgrade && \
  