fireracker: Add extraArgs option

For experimentation, support adding arbitrary extra args.

Author: bjackman

lib/runners/firecracker.nix

@@ -95,7 +95,9 @@ in {
         then socket
         else throw "Firecracker must be configured with an API socket (option microvm.socket)!"
       )
-    ] ++ lib.optional (lib.versionAtLeast pkgs.firecracker.version "1.13.0") "--enable-pci");
+    ]
+    ++ lib.optional (lib.versionAtLeast pkgs.firecracker.version "1.13.0") "--enable-pci")
+    ++ microvmConfig.firecracker.extraArgs;
 
   preStart = ''
     ${preStart}

nixos-modules/microvm/options.nix

@@ -606,6 +606,12 @@ in
       description = "Type of IO engine to use for Firecracker drives (disks).";
     };
 
+    firecracker.extraArgs = mkOption {
+      type = with types; listOf str;
+      default = [];
+      description = "Extra arguments to pass to firecracker.";
+    };
+
     firecracker.extraConfig = mkOption {
       type = types.attrs;
       default = {};