message: Build Docker image from node.js 11
diff: -FROM node:10 as installer
  +FROM node:11 as installer
  COPY . /juice-shop
  WORKDIR /juice-shop
  RUN npm install --production --unsafe-perm
  RUN rm -rf frontend/node_modules
  -FROM node:10-alpine
  +FROM node:11-alpine
  ARG BUILD_DATE
  ARG VCS_REF
  LABEL maintainer="Bjoern Kimminich <bjoern.kimminich@owasp.org>" \
  