Added papermc config

stacks/paper/Dockerfile

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+ARG BASE_IMAGE
+
+# We use ${:-} instead of a default value because the argument is always passed
+# to the build, it'll just be blank most likely
+FROM ${BASE_IMAGE:-'openjdk:17-slim'}
+
+# Build arguments
+ARG MC_VERSION
+ARG PAPERMC_VERSION
+
+# Install mcstatus for healthchecks
+RUN apt update && \
+    apt install --no-install-recommends -y python3-minimal python3-setuptools python3-pip && \
+    python3 -m pip install mcstatus && \
+    apt --purge remove -y python3-pip python3-setuptools && \
+    apt clean && \
+    groupadd -g 1000 paper && \
+    useradd -rMg paper -u 1000 paper
+
+# Create worlds and config directory
+WORKDIR /app
+RUN mkdir -p worlds config/cache
+
+# Download server file
+ADD "https://papermc.io/api/v2/projects/paper/versions/$MC_VERSION/builds/$PAPERMC_VERSION/downloads/paper-$MC_VERSION-$PAPERMC_VERSION.jar" server.jar
+
+# Make sure the server user can access all necessary folders
+RUN chown -R paper:paper /app
+
+# Store the cache in an anonymous volume, which means it won't get stored in the other volumes
+VOLUME /app/config/cache
+
+# Default value to keep users from eating up all ram accidentally
+ENV XMX=4
+ENV MC_VERSION="${MC_VERSION}"
+ENV PAPERMC_VERSION="${PAPERMC_VERSION}"
+
+# Document exposed ports
+EXPOSE 25565
+
+# Switch to non-root user
+USER paper:paper
+
+# Entrypoint runs in /app/config
+COPY entrypoint.sh /entrypoint.sh
+WORKDIR /app/config
+ENTRYPOINT /entrypoint.sh
+
+HEALTHCHECK --interval=30s --timeout=5s --start-period=1m --retries=5 \
+    CMD mcstatus localhost:25565 ping

stacks/paper/entrypoint.sh

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+#!/usr/bin/env bash
+
+# Accept the EULA
+echo "eula=true" > /app/config/eula.txt
+
+# Log the last-used version, so we know which version to use when running it again (e.g. loading the backup)
+echo "${MC_VERSION}, PaperMC v${PAPERMC_VERSION}" >> /app/config/versions.txt
+
+XMS="${XMS:-$XMX}"
+
+# Launch the actual server
+exec java \
+    -Xms"${XMS}G" \
+    -Xmx"${XMX:-$XMS}G" \
+    -XX:+UseG1GC \
+    -XX:+ParallelRefProcEnabled \
+    -XX:MaxGCPauseMillis=200 \
+    -XX:+UnlockExperimentalVMOptions \
+    -XX:+DisableExplicitGC \
+    -XX:+AlwaysPreTouch \
+    -XX:G1NewSizePercent="$([ $XMS -gt 12 ] && echo 40 || echo 30)" \
+    -XX:G1MaxNewSizePercent="$([ $XMS -gt 12 ] && echo 50 || echo 40)" \
+    -XX:G1HeapRegionSize="$([ $XMS -gt 12 ] && echo 16 || echo 8)"M \
+    -XX:G1ReservePercent="$([ $XMS -gt 12 ] && echo 15 || echo 20)" \
+    -XX:G1HeapWastePercent=5 \
+    -XX:G1MixedGCCountTarget=4 \
+    -XX:InitiatingHeapOccupancyPercent="$([ $XMS -gt 12 ] && echo 20 || echo 15)" \
+    -XX:G1MixedGCLiveThresholdPercent=90 \
+    -XX:G1RSetUpdatingPauseTimePercent=5 \
+    -XX:SurvivorRatio=32 \
+    -XX:+PerfDisableSharedMem \
+    -XX:MaxTenuringThreshold=1 \
+    -Dusing.aikars.flags=https://mcflags.emc.gs \
+    -Daikars.new.flags=true \
+    -jar /app/server.jar \
+    --universe /app/worlds \
+    --nogui