Use the deployed image name when running deploy tasks or running arbitrary commands

This ensures the proper image is in use, regardless of the phase in which dokku creates a docker container.

plugins/00_dokku-standard/exec-app-json-scripts

@@ -23,7 +23,7 @@ get_phase_script() {
 
 execute_script() {
   declare desc="executes appropriate phase script key from app.json"
-  local APP="$1"; local IMAGE_TAG="$2"; local IMAGE=$(get_app_image_name "$APP" "$IMAGE_TAG")
+  local APP="$1"; local IMAGE_TAG="$2"; local IMAGE=$(get_deploying_app_image_name "$APP" "$IMAGE_TAG")
   local PHASE_SCRIPT_KEY="$3"
   local SCRIPT_CMD=$(get_phase_script "$IMAGE" "$PHASE_SCRIPT_KEY" 2>/dev/null)
   if [[ -n "$SCRIPT_CMD" ]];then