Clear nextcloud password after use

src/freedombone-app-nextcloud

@@ -146,6 +146,7 @@ function add_user_nextcloud {
     cd /var/www/$NEXTCLOUD_DOMAIN_NAME/htdocs || exit 36
     ${NEXTCLOUD_COMMAND} user:add --password-from-env --display-name="${new_username}" "${new_username}"
 
+    export OC_PASS=
     "${PROJECT_NAME}-pass" -u "$new_username" -a nextcloud -p "$new_user_password"
     echo '0'
 }