feat(script): Add successful snapshot datasets to array (#1)

pacman-zfs-snapshot.sh

@@ -195,6 +195,7 @@ function do_snaps () {
     for snappable_dataset in "${snappable_datasets[@]}"; do
         snap_name="${snappable_dataset}"'@'"${snap_name_prefix}${snap_field_separator}${date_string}${snap_field_separator}"'op:'"${operation}${snap_field_separator}"'sev:'"${severity}${snap_field_separator}"'pkgs:'"${trimmed_pkg_list_oneline}"
         zfs snapshot "${snap_name}" && {
+            successfully_snapped_datasets+=("${snappable_dataset}")
             pprint 'info' 'Snapshot done: '"${snap_name}"
         } || {
             pprint 'warn' 'Snapshot failed: '"${snap_name}"