Avoid exited containers proliferation

When running the `pattern.sh` script multiple times, a lot of
podman exited containers will be left on the machine, adding
`--rm` parameter to `podman run` makes podman automatically
delete the exited containers leaving the machine cleaner.

Author: Lorenzo Dalrio

scripts/pattern-util.sh

@@ -27,7 +27,7 @@ fi
 
 # Do not quote the ${KUBECONF_ENV} below, otherwise we will pass '' to podman
 # which will be confused
-podman run -it \
+podman run -it --rm \
 	--security-opt label=disable \
 	${KUBECONF_ENV} \
 	-v "${HOME}":"${HOME}" \