Enhance cleanup script with comprehensive cleanup and root privileges

- Added root privilege check (must be run with sudo)
- Added removal of build logs (build.log, build_retry.log)
- Added removal of .build directory
- Added removal of cache directory
- Added removal of all ISO files (*.iso)
- Added automatic unmounting of chroot filesystems (dev/pts, dev/shm, proc, sys, etc.)
- Added force unmount for any remaining mounted filesystems
- Ensures clean state for subsequent builds
- Prevents permission issues during cleanup

cleanup.sh

@@ -2,6 +2,13 @@
 
 echo "Cleaning up MBetter ISO build configuration..."
 
+# Check if running as root
+if [ "$EUID" -ne 0 ]; then
+    echo "ERROR: This script must be run with sudo privileges."
+    echo "Usage: sudo ./cleanup.sh"
+    exit 1
+fi
+
 # Revert root password to default in preseed file
 sed -i 's|d-i passwd/root-password-crypted password .*|d-i passwd/root-password password changeme|' config/preseed/debian-installer.cfg
 
@@ -23,7 +30,66 @@ if [ -f "live-image-amd64.iso" ]; then
     echo "Removed previous ISO file"
 fi
 
+# Remove any other ISO files
+for iso_file in *.iso; do
+    if [ -f "$iso_file" ]; then
+        rm "$iso_file"
+        echo "Removed ISO file: $iso_file"
+    fi
+done
+
+# Remove build logs
+if [ -f "build.log" ]; then
+    rm build.log
+    echo "Removed build.log"
+fi
+
+if [ -f "build_retry.log" ]; then
+    rm build_retry.log
+    echo "Removed build_retry.log"
+fi
+
+# Remove .build directory
+if [ -d ".build" ]; then
+    rm -rf .build
+    echo "Removed .build directory"
+fi
+
+# Remove cache directory
+if [ -d "cache" ]; then
+    rm -rf cache
+    echo "Removed cache directory"
+fi
+
+# Unmount any mounted filesystems in chroot
+if [ -d "chroot" ]; then
+    echo "Checking for mounted filesystems in chroot..."
+
+    # Try to unmount common mount points
+    mount_points=(
+        "chroot/dev/pts"
+        "chroot/dev/shm"
+        "chroot/dev"
+        "chroot/proc"
+        "chroot/sys"
+        "chroot/run"
+    )
+
+    for mount_point in "${mount_points[@]}"; do
+        if mountpoint -q "$mount_point" 2>/dev/null; then
+            echo "Unmounting $mount_point..."
+            umount "$mount_point" 2>/dev/null || true
+        fi
+    done
+
+    # Force unmount any remaining mounts
+    if mount | grep -q "chroot"; then
+        echo "Force unmounting remaining chroot mounts..."
+        mount | grep "chroot" | awk '{print $3}' | xargs -r umount -f 2>/dev/null || true
+    fi
+fi
+
 # Clean live-build cache and temporary files
-sudo lb clean
+lb clean
 
 echo "Cleanup completed. Configuration reset to defaults."
\ No newline at end of file