allow tagging and deployment of tagged app images

plugins/apps/post-delete

@@ -1,4 +1,11 @@
 #!/usr/bin/env bash
 set -eo pipefail; [[ $DOKKU_TRACE ]] && set -x
+APP="$1"
 
-[[ -n $1 ]] && rm -r "$DOKKU_ROOT/$1" > /dev/null
+[[ -n $APP ]] && rm -r "$DOKKU_ROOT/$APP" > /dev/null
+
+# remove all application containers & images
+# shellcheck disable=SC2046
+docker rm -f $(docker ps -a --no-trunc | egrep "dokku/${APP}:" | awk '{ print $1 }' | xargs) &>/dev/null || true
+# shellcheck disable=SC2046
+docker rmi $(docker images -q $IMAGE | xargs) &>/dev/null || true