Update vobox_container.md

docs/site/vobox_container.md

 # VOBox Container
 
-This guide describes how to create a networked Docker container for VO-Box use.<br>
+This guide describes how to create a networked **Docker** container for VO-Box use.<br>
+
+A guide for **Apptainer** and **Podman** may now also be found [here](https://gitlab.cern.ch/jalien/container-vobox). This version can run directly from CVMFS, without the need for any additional packages on the host.
+
 For the previous guide refer to the [this](../vobox_legacy) page.
 
 ## Requirements