Added Dockerfile and poll.sh

Dockerfile

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+FROM node:10-slim
+
+RUN apt-get update && apt-get install --assume-yes software-properties-common && \
+  apt-get install --assume-yes git cron
+
+RUN git clone https://github.com/yogthos/mastodon-bot /mastodon-bot && \
+  cd /mastodon-bot && npm install && \
+  npm install -g lumo-cljs
+
+RUN mkdir /config && touch /config/config.edn && touch /var/log/cron.log
+
+ADD poll.sh /poll.sh
+
+ENV MASTODON_BOT_CONFIG /config/config.edn
+VOLUME /config
+
+CMD /poll.sh

poll.sh

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+#!/bin/sh
+
+while true; do
+  echo "Polling Bot"
+  cd /mastodon-bot
+  npm start
+  echo "Poll done, waiting 600 seconds"
+  sleep 600
+done