update: kill keyboxd to prevent umount issues with matter-chroot

matter-chroot/main.sh

@@ -68,6 +68,7 @@ chrt() {
   local ret_code=$?
 
   # kill procs that may prevent umount
+  killall -9 keyboxd   2> /dev/null
   killall -9 dirmngr   2> /dev/null
   killall -9 gpg-agent 2> /dev/null
 

matter-iso/main.sh

@@ -43,9 +43,21 @@ check_retc() {
 
 clean_tmpdir(){
   if [ -d "${tmpdir}" ]; then
+    unset_indent
     info "Cleaning up temp directory"
-    rm -rf "${tmpdir}"
+    set_indent
+    for d in "${tmpdir}/"*; do
+      if mountpoint -q -- "${d}"; then
+        error "Failed: ${d} is still mounted"
+        unset_indent
+        return 1
       fi
+    done
+    rm -rf "${tmpdir}"
+    success "Completed"
+  fi
+  unset_indent
+  return 0
 }
 
 check_iso_vars() {