Install Yarn in container to enable Yarn Audit

Author: MKodde

support/docker/init-test.sh

@@ -8,5 +8,6 @@ docker-compose up -d
 
 docker-compose exec -T php-fpm.readid.stepup.example.com bash -c '
   composer install --prefer-dist -n -o && \
-  ./bin/console cache:clear --env=test
+  ./bin/console cache:clear --env=test && \
+  yarn install --frozen-lockfile
 '

support/docker/php-fpm/Dockerfile

@@ -3,6 +3,13 @@ FROM php:7.2-fpm
 # Copy phpfpm config
 COPY support/docker/php-fpm/app.ini /usr/local/etc/php/conf.d/
 
+# Yank the node and npm binaries from the official Node docker container
+COPY --from=node:14 /usr/local/lib/node_modules /usr/local/lib/node_modules
+COPY --from=node:14 /usr/local/bin/node /usr/local/bin/node
+COPY --from=node:14 /usr/local/bin/yarn /usr/local/bin/yarn
+RUN ln -s /usr/local/lib/node_modules/npm/bin/npm-cli.js /usr/local/bin/npm
+RUN npm install -g yarn
+
 # Install dependencies
 RUN apt-get update && apt-get install -y \
     git \