nixos/systemd-nspawn: accept all Exec and Files options

See: https://www.freedesktop.org/software/systemd/man/systemd.nspawn.html
Closes #49712

nixos/modules/system/boot/systemd-nspawn.nix

@@ -10,8 +10,13 @@ let
   checkExec = checkUnitConfig "Exec" [
     (assertOnlyFields [
       "Boot" "ProcessTwo" "Parameters" "Environment" "User" "WorkingDirectory"
-      "Capability" "DropCapability" "KillSignal" "Personality" "MachineId"
-      "PrivateUsers" "NotifyReady"
+      "PivotRoot" "Capability" "DropCapability" "NoNewPrivileges" "KillSignal"
+      "Personality" "MachineId" "PrivateUsers" "NotifyReady" "SystemCallFilter"
+      "LimitCPU" "LimitFSIZE" "LimitDATA" "LimitSTACK" "LimitCORE" "LimitRSS"
+      "LimitNOFILE" "LimitAS" "LimitNPROC" "LimitMEMLOCK" "LimitLOCKS"
+      "LimitSIGPENDING" "LimitMSGQUEUE" "LimitNICE" "LimitRTPRIO" "LimitRTTIME"
+      "OOMScoreAdjust" "CPUAffinity" "Hostname" "ResolvConf" "Timezone"
+      "LinkJournal"
     ])
     (assertValueOneOf "Boot" boolValues)
     (assertValueOneOf "ProcessTwo" boolValues)
@@ -20,8 +25,8 @@ let
 
   checkFiles = checkUnitConfig "Files" [
     (assertOnlyFields [
-      "ReadOnly" "Volatile" "Bind" "BindReadOnly" "TemporaryFileSystems"
-      "PrivateUsersChown"
+      "ReadOnly" "Volatile" "Bind" "BindReadOnly" "TemporaryFileSystem"
+      "Overlay" "OverlayReadOnly" "PrivateUsersChown"
     ])
     (assertValueOneOf "ReadOnly" boolValues)
     (assertValueOneOf "Volatile" (boolValues ++ [ "state" ]))