Reduce image size

Dockerfile

@@ -1,17 +1,16 @@
-FROM --platform=$TARGETOS/$TARGETARCH openjdk:18.0.2-slim
+FROM --platform=$TARGETOS/$TARGETARCH alpine:3.19
 
 ENV BOT_VERSION 0.4.0
 
-RUN apt-get update -y \
-        && apt-get install -y --no-install-recommends curl \
-        && rm -rf /var/lib/apt/lists/* \
-        && apt-get autoremove -y \
-        && apt-get clean
+RUN apk update \
+    && apk upgrade \
+    && apk add --update openjdk11 curl \
+    && rm -rf /var/cache/apk/*
 
 RUN mkdir -p /opt/jmusicbot/data/
 
 ADD https://github.com/jagrosh/MusicBot/releases/download/$BOT_VERSION/JMusicBot-$BOT_VERSION.jar /opt/jmusicbot/JMusicBot.jar
 
 COPY ./entrypoint.sh /opt/jmusicbot/entrypoint.sh
 
-ENTRYPOINT ["/bin/sh", "/opt/jmusicbot/entrypoint.sh"]
+ENTRYPOINT ["/bin/sh", "/opt/jmusicbot/entrypoint.sh"]