Add SKIP_NSSWITCH_CONF option

For #416

Dockerfile

@@ -29,8 +29,6 @@ RUN addgroup -g 1000 minecraft \
 
 EXPOSE 25565 25575
 
-RUN echo 'hosts: files dns' > /etc/nsswitch.conf
-
 ARG ARCH=amd64
 
 ARG EASY_ADD_VER=0.3.0

start

@@ -16,6 +16,10 @@ if [ $(id -u) = 0 ]; then
     chown -R minecraft:minecraft /data
   fi
 
+  if [[ ${SKIP_NSSWITCH_CONF^^} != TRUE ]]; then
+    echo 'hosts: files dns' > /etc/nsswitch.conf
+  fi
+
   exec su-exec minecraft:minecraft /start-configuration $@
 else
   exec /start-configuration $@