nixos/networkd: add dhcpServerConfig.PersistLeases option (#353189)

Author: fpletz

nixos/modules/system/boot/networkd.nix

@@ -1039,6 +1039,7 @@ let
           "BootServerName"
           "BootFilename"
           "IPv6OnlyPreferredSec"
+          "PersistLeases"
         ])
         (assertInt "PoolOffset")
         (assertMinimum "PoolOffset" 0)
@@ -1053,6 +1054,7 @@ let
         (assertValueOneOf "EmitRouter" boolValues)
         (assertValueOneOf "EmitTimezone" boolValues)
         (assertValueOneOf "BindToInterface" boolValues)
+        (assertValueOneOf "PersistLeases" boolValues)
       ];
 
       sectionIPv6SendRA = checkUnitConfig "IPv6SendRA" [