Add support to generate charts in habits plugin (#26)

* Add charts to habits plugin
* Dockerfile update
* Add support for dflags

Dockerfile

@@ -1,25 +1,29 @@
-# Based on https://github.com/GoogleChrome/puppeteer/blob/master/docs/troubleshooting.md#running-puppeteer-in-docker
-
 # Base image
-FROM node:15-slim
+FROM node:15-buster-slim
 
-# Install latest chrome dev package and fonts to support major charsets
-RUN apt-get update \
+# Copy GitHub action
+COPY action/dist/index.js /index.js
+
+# Setup
+RUN chmod +x /index.js \
+  # Install latest chrome dev package, fonts to support major charsets and skip chromium download on puppeteer install
+  # Based on https://github.com/GoogleChrome/puppeteer/blob/master/docs/troubleshooting.md#running-puppeteer-in-docker
+  && 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
+  && rm -rf /var/lib/apt/lists/* \
+  # Install ruby to support linguist
+  # Based on https://github.com/github/linguist
+  && apt-get update \
+  && apt-get install -y ruby-full \
+  && apt-get install -y git g++ cmake pkg-config libicu-dev zlib1g-dev libcurl4-openssl-dev libssl-dev ruby-dev \
+  && gem install github-linguist
 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
+# Execute GitHub action
 ENTRYPOINT node /index.js