Use a docker image to support puppeteer (#7)

Dockerfile

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+# Based on https://github.com/GoogleChrome/puppeteer/blob/master/docs/troubleshooting.md#running-puppeteer-in-docker
+
+# Base image
+FROM node:15-slim
+
+# Install latest chrome dev package and fonts to support major charsets
+RUN apt-get update \
+  && apt-get install -y wget gnupg ca-certificates libgconf-2-4 \
+  && 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-stable fonts-ipafont-gothic fonts-wqy-zenhei fonts-thai-tlwg fonts-kacst fonts-freefont-ttf libxss1 \
+    --no-install-recommends \
+  && rm -rf /var/lib/apt/lists/*
+
+# Uncomment to skip the chromium download when installing puppeteer
+ENV PUPPETEER_SKIP_CHROMIUM_DOWNLOAD true
+ENV PUPPETEER_BROWSER_PATH "google-chrome-stable"
+
+# Copy action
+COPY action/dist/index.js /index.js
+RUN chmod +x /index.js
+
+# Execute action
+ENTRYPOINT node /index.js