Merge pull request #34 from orca-scan/master

Fix incompatibility with Dokku v0.32.3

Author: josegonzalez

pre-build

@@ -1,7 +1,10 @@
 #!/usr/bin/env bash
 set -eo pipefail; [[ $DOKKU_TRACE ]] && set -x
 source "$PLUGIN_ENABLED_PATH/common/functions"
-APP="$1"
+BUILDER_TYPE="$1" APP="$2"
+if [[ "$BUILDER_TYPE" != "herokuish" ]]; then
+  exit 0
+fi
 IMAGE=$(get_app_image_name $APP)
 
 APP_SPECIFIC_KEY_FOLDER="$DOKKU_ROOT/.hostkeys/$APP/.ssh"