[SIS-xxx] reducing size of bot image

deployment/image-packaging/src/main/docker/sissi/Dockerfile

@@ -1,8 +1,32 @@
-FROM amazoncorretto:17.0.8-alpine3.18
-MAINTAINER Sheldan
-VOLUME /tmp
-ADD config/* /config/
-ADD wrapper/*.sh /
+# https://careers.wolt.com/en/blog/tech/how-to-reduce-jvm-docker-image-size
+FROM amazoncorretto:17.0.14-alpine3.20 AS corretto-jdk
+
+RUN apk add --no-cache binutils
+
+RUN $JAVA_HOME/bin/jlink \
+         --verbose \
+         --add-modules ALL-MODULE-PATH \
+         --strip-debug \
+         --no-man-pages \
+         --no-header-files \
+         --compress=2 \
+         --output /customjre
+
+FROM alpine:3.21
+
+ENV JAVA_HOME=/jre
+ENV PATH="${JAVA_HOME}/bin:${PATH}"
+
+COPY --from=corretto-jdk /customjre $JAVA_HOME
+
+ARG APPLICATION_USER=appuser
+
+RUN adduser --no-create-home -u 1000 -D $APPLICATION_USER
+
+RUN mkdir /app && chown -R $APPLICATION_USER /app
+
+COPY --chown=1000:1000 config/* /config/
+COPY --chown=1000:1000 wrapper/*.sh /
 RUN chmod +x /start.sh
-ADD bot/app.jar /app.jar
+COPY --chown=1000:1000 bot/app.jar /app.jar
 CMD ["/start.sh"]