create user in dockerfile, add start script for container

mosquitto-start.sh

@@ -0,0 +1,19 @@
+#!/bin/bash
+
+IMAGE=registry.gitlab.com/wolutator/mosquitto-with-auth:latest
+VOLUME=mosquitto-config
+
+docker volume inspect $VOLUME > /dev/null || docker volume create $VOLUME
+
+docker pull $IMAGE
+
+docker run \
+  -it \
+  --rm \
+  -p1883:1883 \
+  -v $VOLUME:/opt/etc/mosquitto \
+  --link mariadb \
+  --name mosquitto \
+  $IMAGE /bin/bash
+
+