fix: shellcheck tipps

container-update.sh

@@ -15,17 +15,15 @@ for compose_file in /opt/docker/**/docker-compose.yml; do
 done
 
 echo "> Containers have been updated."
-echo ""
 
 confirm=n
-read -p "
-> Do you want to prune docker? [y/N]
-> WARNING! This will remove:
+echo "
+> WARNING! The following confirmation will remove:
 >   - all stopped containers
 >   - all networks not used by at least one container
 >   - all dangling images
->   - unused build cache
-" confirm
+>   - unused build cache"
+read -rp "> Do you want to prune docker? [y/N] " confirm
 echo ""
 
 if [[ $confirm == [yY] ]]; then