refactor to explicitly set IMAGE via get_app_image_name()

plugins/apps/commands

@@ -21,7 +21,8 @@ case "$1" in
     [[ -z $2 ]] && echo "Please specify an app to run the command on" && exit 1
     [[ "$2" == "tls" ]] && echo "Unable to destroy tls directory" && exit 1
     [[ "$3" == "force" ]] && DOKKU_APPS_FORCE_DELETE=1
-    APP="$2"; verify_app_name "$APP"
+    APP="$2"; IMAGE_TAG=$(get_running_image_tag $APP)
+    verify_app_name "$APP"
 
     if [[ -z "$DOKKU_APPS_FORCE_DELETE" ]]; then
       dokku_log_warn "WARNING: Potentially Destructive Action"
@@ -38,7 +39,7 @@ case "$1" in
 
     echo "Destroying $APP (including all add-ons)"
 
-    pluginhook pre-delete $APP
+    pluginhook pre-delete $APP $IMAGE_TAG
     DOKKU_APP_CIDS=$(get_app_container_ids $APP)
     if [[ -n $DOKKU_APP_CIDS ]]; then
       for ID in $DOKKU_APP_CIDS;do
@@ -47,7 +48,7 @@ case "$1" in
       done
     fi
 
-    pluginhook post-delete $APP
+    pluginhook post-delete $APP $IMAGE_TAG
     ;;
 
   help | apps:help)

plugins/apps/pre-delete

@@ -2,7 +2,7 @@
 set -eo pipefail; [[ $DOKKU_TRACE ]] && set -x
 source "$(dirname $0)/../common/functions"
 
-APP="$1"; CACHE_DIR="$DOKKU_ROOT/$APP/cache"
+APP="$1"; IMAGE_TAG="$2"; IMAGE=$(get_app_image_name $APP $IMAGE_TAG); CACHE_DIR="$DOKKU_ROOT/$APP/cache"
 verify_app_name "$APP"
 
 if [[ -d $CACHE_DIR ]]; then