Use aanand/wait image to wait for service to be ready

commands

@@ -36,7 +36,7 @@ case "$1" in
     echo "$ID" > "$SERVICE_ROOT/ID"
 
     dokku_log_verbose_quiet "Waiting for container to be ready"
-    sleep 10
+    docker run --rm --link "$SERVICE_NAME:$PLUGIN_COMMAND_PREFIX" aanand/wait > /dev/null
 
     dokku_log_verbose_quiet "Creating container database"
     IP=$(get_container_ip "$ID")

install

@@ -7,6 +7,7 @@ if ! docker images | grep -e "^$PLUGIN_IMAGE " | grep -q "$PLUGIN_IMAGE_VERSION"
 fi
 
 docker pull svendowideit/ambassador:latest
+docker pull aanand/wait:latest
 
 mkdir -p "$PLUGIN_DATA_ROOT" || echo "Failed to create $PLUGIN_SERVICE directory"
 chown dokku:dokku "$PLUGIN_DATA_ROOT"