Added variable to configure stop duration

Fixes #617

README.md

@@ -1104,6 +1104,10 @@ Some older versions (pre-1.14) of Spigot required `--noconsole` to be passed whe
 Some older servers get confused and think that the GUI interface is enabled. You can explicitly
 disable that by passing `-e GUI=FALSE`.
 
+### Stop Duration
+
+When the container is signalled to stop, the Minecraft process wrapper will attempt to send a "stop" command via RCON or console and waits for the process to gracefully finish. By defaul it waits 60 seconds, but that duration can be configured by setting the environment variable `STOP_DURATION` to the number of seconds.
+
 ## Running on RaspberryPi
 
 To run this image on a RaspberryPi 3 B+, 4, or newer, use the image tag

start-minecraftFinalSetup

@@ -173,7 +173,7 @@ function copyFilesForCurseForge() {
   cp -f /data/eula.txt "${FTB_DIR}/"
 }
 
-mcServerRunnerArgs="--stop-duration 60s"
+mcServerRunnerArgs="--stop-duration ${STOP_DURATION:-60}s"
 if [[ ${TYPE} == "CURSE_INSTANCE" ]]; then
     if isTrue ${DEBUG_EXEC}; then
       set -x