switch to jdk as baseimage

blubb/Dockerfile

@@ -1,12 +1,32 @@
-FROM dockcenter/velocity:stable
+FROM eclipse-temurin:17-jdk-alpine
+
+EXPOSE 25577
+
+
+ENV JAVA_MEMORY="512M"
+ENV JAVA_FLAGS="-XX:+UseStringDeduplication -XX:+UseG1GC -XX:G1HeapRegionSize=4M -XX:+UnlockExperimentalVMOptions -XX:+ParallelRefProcEnabled -XX:+AlwaysPreTouch"
+
+WORKDIR /data
+
+RUN apk add --upgrade --no-cache openssl && \
+    addgroup -S velocity && \
+    adduser -S velocity -G velocity && \
+    chown velocity:velocity /data
+
+USER velocity
+
+VOLUME /data
 
 EXPOSE 25577
 
 RUN wget https://api.papermc.io/v2/projects/velocity/versions/3.2.0-SNAPSHOT/builds/294/downloads/velocity-3.2.0-SNAPSHOT-294.jar
 RUN mv velocity-*.jar /opt/velocity/velocity.jar
+
 RUN wget https://github.com/Aelysium-Group/rusty-connector/releases/download/v0.7.0/rusty-connector-0.7.0.jar
 RUN mkdir /data/plugins
 RUN mv rusty-connector-*.jar /data/plugins/rusty-connector.jar
 COPY velocity.toml /data
 COPY --chown=velocity:velocity velocity_config  /data/plugins/rustyconnector-velocity/
-RUN ln -s /mnt/secrets/private.key /data/plugins/rustyconnector-velocity/private.key
+RUN ln -s /mnt/secrets/private.key /data/plugins/rustyconnector-velocity/private.key
+
+ENTRYPOINT java -Xms$JAVA_MEMORY -Xmx$JAVA_MEMORY $JAVA_FLAGS -jar /opt/velocity/velocity.jar