Support reboot in non-chroot modes using grub and an init script

We use grub-2.06 as 2.12 has some packaging issues, and can't be
built in live-bootstrap for now.

steps/grub-2.06/pass1.sh

@@ -0,0 +1,35 @@
+# SPDX-FileCopyrightText: 2024 Gábor Stefanik <netrolller.3d@gmail.com>
+#
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+src_prepare() {
+    default
+
+    # Remove pregenerated gnulib files
+    pushd ../gnulib-d271f86
+    rm lib/unictype/ctype*.h
+    rm lib/unicase/tolower.h
+    popd
+
+    . ../../import-gnulib.sh
+
+    for patchname in fix-base64 fix-null-deref fix-null-state-deref fix-regcomp-uninit-token \
+        fix-regexec-null-deref fix-uninit-structure fix-unused-value fix-width no-abort; do
+        patch -d grub-core/lib/gnulib -p2 < "grub-core/lib/gnulib-patches/$patchname.patch"
+    done
+
+    ./autogen.sh
+
+    cp -a INSTALL INSTALL.grub
+    autoreconf-2.69 -vif
+    mv INSTALL.grub INSTALL
+}
+
+src_configure() {
+    CFLAGS="-Wno-error" ./configure --prefix="${PREFIX}" --sbindir="${PREFIX}/bin" --build=i686-pc-linux-musl
+}
+
+src_install() {
+    default
+    rm "${DESTDIR}${PREFIX}/share/info/dir"
+}