added papermc, waterfall and a small script update

siverten/papermc/Dockerfile

@@ -0,0 +1,17 @@
+FROM openjdk:16-slim
+
+ENV MC_VERSION="latest" \
+    PAPER_BUILD="latest" \
+    MC_RAM="4G" \
+    JAVA_OPTS=""
+
+ADD papermc.sh .
+RUN apt-get update \
+    && apt-get install -y wget \
+    && apt-get install -y jq \
+    && mkdir /papermc
+
+CMD ["sh", "./papermc.sh"]
+
+EXPOSE 25565
+VOLUME /papermc

siverten/papermc/papermc.sh

@@ -0,0 +1,31 @@
+#!/bin/bash
+cd papermc
+urlPrefix=https://papermc.io/api/v2/projects/paper
+if [ ${MC_VERSION} = latest ]; then
+  MC_VERSION=$(wget -qO - $urlPrefix | jq -r '.versions[-1]') # "-r" is needed because the output has quotes otherwise
+fi
+urlPrefix=${urlPrefix}/versions/${MC_VERSION}
+if [ ${PAPER_BUILD} = latest ]; then
+  PAPER_BUILD=$(wget -qO - $urlPrefix | jq '.builds[-1]')
+fi
+JAR_NAME=papermc-${MC_VERSION}-${PAPER_BUILD}.jar
+if [ ! -e ${JAR_NAME} ]; then
+  rm -f *.jar
+  wget ${urlPrefix}/builds/${PAPER_BUILD}/downloads/paper-${MC_VERSION}-${PAPER_BUILD}.jar -O ${JAR_NAME}
+  if [ ! -e eula.txt ]; then
+    java -jar ${JAR_NAME}
+    sed -i 's/false/true/g' eula.txt
+  fi
+fi
+
+#exec java -server -Xms${MC_RAM} -Xmx${MC_RAM} ${JAVA_OPTS} -jar ${JAR_NAME} nogui
+exec java -Xms${MC_RAM} -Xmx${MC_RAM} -XX:+UseG1GC \
+  -XX:+ParallelRefProcEnabled -XX:MaxGCPauseMillis=200 \
+  -XX:+UnlockExperimentalVMOptions -XX:+DisableExplicitGC \
+  -XX:+AlwaysPreTouch -XX:G1NewSizePercent=30 -XX:G1MaxNewSizePercent=40 \
+  -XX:G1HeapRegionSize=8M -XX:G1ReservePercent=20 -XX:G1HeapWastePercent=5 \
+  -XX:G1MixedGCCountTarget=4 -XX:InitiatingHeapOccupancyPercent=15 \
+  -XX:G1MixedGCLiveThresholdPercent=90 -XX:G1RSetUpdatingPauseTimePercent=5 \
+  -XX:SurvivorRatio=32 -XX:+PerfDisableSharedMem -XX:MaxTenuringThreshold=1 \
+  ${JAVA_OPTS} -jar ${JAR_NAME} nogui
+