Use $DOKKU_ROOT instead of $HOME

dokku

@@ -24,7 +24,7 @@ case "$1" in
     ;;
 
   build)
-    APP="$2"; IMAGE="$3"; CACHE_DIR="$HOME/$APP/cache"
+    APP="$2"; IMAGE="$3"; CACHE_DIR="$DOKKU_ROOT/$APP/cache"
     id=$(cat | docker run -i -a stdin progrium/buildstep /bin/bash -c "mkdir -p /app && tar -xC /app")
     test $(docker wait $id) -eq 0
     docker commit $id $IMAGE > /dev/null

plugins/00_dokku-standard/pre-delete

@@ -3,7 +3,7 @@ set -eo pipefail; [[ $DOKKU_TRACE ]] && set -x
 
 APP="$1"
 IMAGE=app/"$1"
-CACHE_DIR="$HOME/$APP/cache"
+CACHE_DIR="$DOKKU_ROOT/$APP/cache"
 
 docker run -v $CACHE_DIR:/cache $IMAGE find /cache -depth -mindepth 1 -maxdepth 1 -exec rm -Rf {} \;