Add permission fixing cmd

Since we run karrot as karrot user now, the uploads need to be
owned by that user.

abra.sh

@@ -1,2 +1,16 @@
-export NGINX_CONFIG_VERSION=v23
-export GEOIP_CONFIG_VERSION=v1
+fix-permissions() {
+  if [ "$(whoami)" != "root" ]; then
+    echo "error: you must be root to fix permissions"
+    echo "Try adding '--user root'"
+    exit 1
+  fi
+  if [ ! -d /app/uploads ]; then
+    echo "error: no uploads dir!"
+    echo "Make sure to run it on the 'app' service"
+    exit 1
+  fi
+  echo "Fixing upload permissions"
+  echo "Making karrot the owner of uploads"
+  chown -R karrot:karrot /app/uploads
+  echo "Done"
+}