Added fabric server

fabric/Dockerfile

@@ -0,0 +1,53 @@
+FROM openjdk:8-jre
+
+# This argument should be set when building
+ARG VERSION
+ARG JAR_URL="https://maven.fabricmc.net/net/fabricmc/fabric-installer/$VERSION/fabric-installer-$VERSION.jar"
+
+WORKDIR /mc
+
+# Download installer jar
+ADD "https://maven.fabricmc.net/net/fabricmc/fabric-installer/$VERSION/fabric-installer-$VERSION.jar" fabric-installer.jar
+
+# Install fabric, sign eula & remove installer
+RUN java -jar fabric-installer.jar server -downloadMinecraft && \
+rm fabric-installer.jar && \
+echo "eula=true" > eula.txt
+
+# Store the cache in an anonymous volume, which means it won't get stored in the other volumes
+VOLUME /mc/config/cache
+
+# Default value to keep users from eating up all ram accidentally
+ENV XMS=4
+
+WORKDIR /mc/config
+# Source for flags:
+# https://aikar.co/2018/07/02/tuning-the-jvm-g1gc-garbage-collector-flags-for-minecraft/
+# Certain flags auto-scale if XMS is greater than 12 (see link for info)
+ENTRYPOINT mv -n /mc/*.jar /mc/config && 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 fabric-server-launch.jar \
+--universe /mc/worlds \
+--nogui
+