treewide: add license header and enable haslicense linter

Change-Id: I873a8d4082d75e8f813d8a726a41187eea7a065e
Reviewed-on: https://review.monogon.dev/c/monogon/+/3825
Tested-by: Jenkins CI
Reviewed-by: Leopold Schabel <leo@monogon.tech>
diff --git a/osbase/test/ktest/run_ktest.sh b/osbase/test/ktest/run_ktest.sh
index 02920a1..3607b85 100755
--- a/osbase/test/ktest/run_ktest.sh
+++ b/osbase/test/ktest/run_ktest.sh
@@ -1,2 +1,7 @@
 #!/bin/bash
+#
+# Copyright The Monogon Project Authors.
+# SPDX-License-Identifier: Apache-2.0
+#
+
 exec "$1" -initrd-path "$2" -kernel-path "$3" -cmdline "$4"
\ No newline at end of file