Add Dockerfile - closes #1

docker/Dockerfile

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+FROM openjdk:11-jre-slim
+
+ENV JMB_VERSION 0.4.0-bypass
+
+#No downloadable example config since 0.2.10
+RUN mkdir -p /jmb/config
+ADD https://github.com/sks316/MusicBot/releases/download/$JMB_VERSION/JMusicBot-$JMB_VERSION.jar /jmb/JMusicBot.jar
+ADD https://github.com/jagrosh/MusicBot/releases/download/0.2.9/config.txt /jmb/config/config.txt
+
+COPY ./docker-entrypoint.sh /jmb
+COPY ./config.txt /jmb/config
+
+RUN chmod +x /jmb/docker-entrypoint.sh
+
+ENTRYPOINT ["/jmb/docker-entrypoint.sh"]

docker/docker-entrypoint.sh

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+#!/bin/sh
+
+echo "Starting JMusicBot by Jagrosh https://github.com/jagrosh/MusicBot"
+echo "Using JMusicBot-bypass fork by sks316 https://github.com/sks316/MusicBot"
+echo "Containerized by Craumix https://github.com/Craumix/jmb-container"
+echo "Version: $JMB_VERSION"
+
+cd /jmb/config
+java -jar -Dnogui=true /jmb/JMusicBot.jar
+
+echo "Seems like java stopped... Waiting for 30 seconds before termination..."
+sleep 30s
+echo "Terminating!"