change how base image builds

base-image-script/debian-build_pt3.sh

@@ -0,0 +1,36 @@
+#!/bin/bash
+# Copyright (c) 2025 fithwum
+# All rights reserved
+set -e
+
+# Auto-detect a single debian-* directory if not passed
+if [ -n "$1" ]; then
+    ROOTFS_DIR="$1"
+else
+    ROOTFS_DIR=$(find . -maxdepth 1 -type d -name "debian-*" | sed 's|^\./||' | head -n 1)
+    if [ -z "$ROOTFS_DIR" ]; then
+        echo "[ERROR] No debian-* rootfs directory found!"
+        exit 1
+    fi
+fi
+
+TARBALL="/output/${ROOTFS_DIR}.tar.bz2"
+
+echo "[INFO] Unmounting system directories (ignore errors)..."
+for dir in sys proc dev/pts dev; do
+    umount -lf "$ROOTFS_DIR/$dir" 2>/dev/null || true
+done
+
+echo "[INFO] Removing chroot script..."
+rm -f "$ROOTFS_DIR/root/${ROOTFS_DIR}_pt2.sh" 2>/dev/null || true
+
+echo "[INFO] Rootfs size:"
+du -sh "$ROOTFS_DIR"
+
+echo "[INFO] Creating compressed base image..."
+tar -cjf "$TARBALL" -C "$ROOTFS_DIR" .
+
+echo "[INFO] Image archive size:"
+du -sh "$TARBALL"
+
+echo "[INFO] Tarball ready for CI to upload: $TARBALL"