build a kernel, using malta_kvm_defconfig

(there's a lot in this config that I don't think is needed)

make-kernel.nix

@@ -0,0 +1,29 @@
+pkgs: config:
+let
+  inherit (pkgs) callPackage buildPackages stdenvNoCC fetchFromGitHub;
+  source = fetchFromGitHub {
+    owner = "torvalds";
+    repo = "linux";
+    rev = "3d7cb6b04c3f3115719235cc6866b10326de34cd";  # v5.19
+    hash = "sha256-OVsIRScAnrPleW1vbczRAj5L/SGGht2+GnvZJClMUu4=";
+  };
+  tree = stdenvNoCC.mkDerivation {
+    name = "spindled-kernel-tree";
+    src = source;
+    phases = [ "unpackPhase" "patchScripts" "installPhase" ];
+    patchScripts = ''
+      patchShebangs scripts/
+      # substituteInPlace Makefile --replace /bin/pwd ${buildPackages.pkgs.coreutils}/bin/pwd
+    '';
+    installPhase = ''
+      mkdir -p $out
+      cp -a . $out
+    '';
+  };
+in
+{
+  vmlinux = callPackage ./make-vmlinux.nix {
+    inherit tree;
+    config = config.kernel.config;
+  };
+}