first setup

Dockerfile

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+FROM eclipse-temurin:17-jdk
+
+ENV MAX_MEM=1G
+
+RUN apt-get update \
+  && DEBIAN_FRONTEND=noninteractive \
+  apt-get install -y \
+    imagemagick \
+    gosu \
+    sudo \
+    net-tools \
+    iputils-ping \
+    curl wget \
+    git \
+    jq \
+    dos2unix \
+    mysql-client \
+    tzdata \
+    rsync \
+    nano \
+    unzip \
+    knockd \
+    ttf-dejavu \
+    jq \
+    && apt-get clean
+
+RUN addgroup --gid 1000 velocity \
+  && adduser --system --shell /bin/false --uid 1000 --ingroup velocity --home /data velocity
+RUN mkdir /velocity && chown 1000:1000 /velocity
+
+ADD ./build.sh /tmp
+RUN /tmp/build.sh
+
+WORKDIR /data
+CMD java -Xms$MAX_MEM -Xmx$MAX_MEM -XX:+UseG1GC -XX:G1HeapRegionSize=4M -XX:+UnlockExperimentalVMOptions -XX:+ParallelRefProcEnabled -XX:+AlwaysPreTouch -XX:MaxInlineLevel=15 -jar /velocity/velocity.jar

build.sh

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+#!/bin/bash
+
+curl 'https://papermc.io/api/v2/projects/velocity/version_group/3.0.0/builds' -H 'User-Agent: docker-build simcop2387@simcop2387.info' | jq -r '.builds[-1]' | tee /tmp/velocity.json
+wget -O /tmp/velocity.jar $(jq -r '"https://papermc.io/api/v2/projects/velocity/versions/"+(.version|tostring)+"/builds/"+(.build|tostring)+"/downloads/"+ (.downloads.application.name|tostring)' < /tmp/velocity.json)
+CALCULATED=$(sha256sum /tmp/velocity.jar | cut -d' ' -f1)
+PROVIDED=$(jq -r '.downloads.application.sha256' < /tmp/velocity.json)
+
+if [[ $CALCULATED == $PROVIDED ]]; then
+        echo download successful, moving to final location
+        mv /tmp/velocity.jar /velocity/
+else
+        echo FAILED SHA256 SUM CHECK: $CALCULATED != 
+        exit 127
+fi