Regarding the minecraft-server image
The start script currently does not pass command line arguments to the next script. This makes it so server admins can't easily update their server to 1.13.2 by passing --forceUpgrade as an extra parameter after specifying the docker image. With this change it works as intended.
Proof that the arguments did not get added before and do now:
* Add this line to the start-minecraftFinalSetup script: `echo "Running with: mc-server-runner ${bootstrapArgs} java $JVM_XX_OPTS $JVM_OPTS -jar $SERVER ""$@"" $EXTRA_ARGS"`
* Build the image
* Run the image with extra arguments `--test`
* See this printed: `Running with: mc-server-runner -jar minecraft_server.1.13.2.jar`
* Update to this PR
* Build the image
* See this printed: `Running with: mc-server-runner -jar minecraft_server.1.13.2.jar --test`
Do this to allow write access for groups that the minecraft user is in.
This commit also fixes an issue if a group is specified with $GID and it has
no write access in the mounted host volume.
