17 pruning doesnt work as intended when running vorta as a container (#…

…18)

* Add instructions on setting hostname to facilitate pruning

README.md

@@ -5,6 +5,8 @@ Currently using Vorta 0.8.12 release on jlesage/baseimage-gui:alpine-3.17-v4 ima
 
 ## Usage
 
+Please note that it is highly recommended to set a `hostname` when running this container.  This results in a consistent hostname for the container and allows the *prune* functionality to work correctly.  If you do not set this, a random hostname will be generated by Docker and you will need to adjust the *prune* settings in the UI so that it doesn't use the hostname as a filter.
+
 Using `docker-compose.yml`: (set TZ, USER_ID, and GROUP_ID in `.env`.)
 
 ```
@@ -35,6 +37,7 @@ $ mkdir config
 $ podman run -it --rm -v ./config:/config \
     -p 5900:5900  \
     -e USER_ID=1028 -e GROUP_ID=100 \
+    --hostname vorta  \
     --uidmap=0:1:1028 --uidmap=1028:0:1 --uidmap=1029:1029:64507 \
     ghcr.io/borgbase/vorta-docker:latest
 ```