Bind to all available interfaces -- seems to fix an issue where a metabase...

Bind to all available interfaces -- seems to fix an issue where a metabase container can't be accessed from multiple docker networks.

bin/docker/run_metabase.sh

@@ -2,7 +2,7 @@
 
 # if nobody manually set a host to list on then go with $HOSTNAME
 if [ -z "$MB_JETTY_HOST" ]; then
-    export MB_JETTY_HOST=$HOSTNAME
+    export MB_JETTY_HOST=0.0.0.0
 fi