Add Docker Image

Dockerfile

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+FROM adoptopenjdk:16-openj9
+
+RUN groupadd -g 322 lavalink && \
+    useradd -r -u 322 -g lavalink lavalink
+
+USER lavalink
+
+WORKDIR /opt
+RUN apt update & \
+    apt install curl & \
+    curl -Lso Lavalink.jar https://github.com/freyacodes/Lavalink/releases/download/3.3.2.5/Lavalink.jar \
+    apt remove curl
+COPY application.yml .
+
+ENTRYPOINT ["java", "-Djdk.tls.client.protocols=TLSv1.3", "-Xmx3G", "-jar", "Lavalink.jar"]