feat(image): install upstream kexec which now have support for UKIs

pkgs/kexec-tools/default.nix

@@ -0,0 +1,62 @@
+{
+  lib,
+  stdenv,
+  buildPackages,
+  fetchFromGitHub,
+  autoconf,
+  zlib,
+}:
+
+stdenv.mkDerivation {
+  pname = "kexec-tools";
+  version = "main";
+
+  src = fetchFromGitHub {
+    owner = "horms";
+    repo = "kexec-tools";
+    rev = "a7fcd424c4c80dea5a2fd5ffa274ffeb8129c790";
+    hash = "sha256-QKE+KCkueA21zNunTMidP9OuZaw0IG5tFDF4UJITTTQ=";
+  };
+
+  dontPatchShebangs = true;
+
+  hardeningDisable = [
+    "format"
+    "pic"
+    "relro"
+    "pie"
+  ];
+
+  buildCommand = ''
+    unpackPhase
+    mkdir -p $out
+    cd source
+    ./bootstrap
+    ./configure --prefix=/
+    make DESTDIR=$out install
+  '';
+
+  depsBuildBuild = [ buildPackages.stdenv.cc ];
+
+  buildInputs = [
+    zlib
+    autoconf
+  ];
+
+  enableParallelBuilding = true;
+
+  meta = with lib; {
+    homepage = "http://horms.net/projects/kexec/kexec-tools";
+    description = "Tools related to the kexec Linux feature";
+    platforms = platforms.linux;
+    badPlatforms = [
+      "microblaze-linux"
+      "microblazeel-linux"
+      "riscv64-linux"
+      "riscv32-linux"
+      "sparc-linux"
+      "sparc64-linux"
+    ];
+    license = licenses.gpl2Only;
+  };
+}