feat: add mkrootfs script

Signed-off-by: Coelacanthus <coelacanthus@outlook.com>

.gitignore

@@ -0,0 +1,5 @@
+archriscv-*.tar.*
+archriscv-*.qcow2
+dracut-hook/
+rootfs/
+qcow2/

mkrootfs.sh

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+#!/usr/bin/bash
+#
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+# shellcheck disable=1091
+. /usr/share/makepkg/util.sh
+colorize
+
+msg "Building rootfs..."
+mkdir -p ./rootfs
+sudo pacstrap \
+    -C /usr/share/devtools/pacman-extra-riscv64.conf \
+    -M \
+    ./rootfs \
+    base
+
+msg "Clean up pacman package cache..."
+yes y | sudo pacman \
+    --sysroot ./rootfs \
+    --sync --clean --clean
+
+msg "Set root password (Default: archriscv)..."
+usermod --root ./rootfs --password archriscv root
+
+msg "Compressing rootfs..."
+sudo bsdtar --create --zstd --verbose --xattrs --acls -f "archriscv-$(date --rfc-3339=date).tar.zst" -C rootfs/ .