docs: adjust readme

examples/vouchervault/README.md

@@ -5,4 +5,15 @@
 # Notes
 
 > [!WARNING]
-> The container runs as low-privileged `www-data` user. So you have to adjust the permissions for the persistent database bind mount volume. A command like `sudo chown -R www-data:www-data <path-to-volume-data-dir>` should work. Afterwards, please restart the container.
+> The container runs as low-privileged `www-data` user. So you have to adjust the permissions for the persistent database bind mount volume.
+
+````
+# create volume dir for persistence
+mkdir -p /mnt/docker-volumes/vouchervault/database
+
+# adjust permissions
+sudo chown -R www-data:www-data /mnt/docker-volumes/vouchervault/*
+
+# spawn the container stack
+docker compose up
+````