Add correct Chrome install for puppeteer

Dockerfile

@@ -82,3 +82,16 @@ RUN chmod a+x /bin/wait-for-it.sh
 # install Hex
 RUN mix local.hex --force
 RUN mix hex.info
+
+# install headless Chrome compatible with puppeteer
+RUN apt-get update && apt-get install -yq libgconf-2-4
+RUN apt-get update && apt-get install -y wget --no-install-recommends \
+  && wget -q -O - https://dl-ssl.google.com/linux/linux_signing_key.pub | apt-key add - \
+  && sh -c 'echo "deb [arch=amd64] http://dl.google.com/linux/chrome/deb/ stable main" >> /etc/apt/sources.list.d/google.list' \
+  && apt-get update \
+  && apt-get install -y google-chrome-unstable fonts-ipafont-gothic fonts-wqy-zenhei fonts-thai-tlwg fonts-kacst ttf-freefont \
+    --no-install-recommends \
+  && rm -rf /var/lib/apt/lists/* \
+  && apt-get purge --auto-remove -y curl \
+  && rm -rf /src/*.deb
+