nixos/borgbackup: support specific warning codes when failOnWarnings=false (NixOS#368701)

Author: symphorien

nixos/modules/services/backup/borgbackup.nix

@@ -44,8 +44,8 @@ let
     borgWrapper () {
       local result
       borg "$@" && result=$? || result=$?
-      if [[ -z "${toString cfg.failOnWarnings}" ]] && [[ "$result" == 1 ]]; then
-        echo "ignoring warning return value 1"
+      if [[ -z "${toString cfg.failOnWarnings}" ]] && [[ "$result" == 1 || ("$result" -ge 100 && "$result" -le 127) ]]; then
+        echo "ignoring warning return value $result"
         return 0
       else
         return "$result"