Update utils/find_1st_log_entry.sh

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
Signed-off-by: Łukasz Gryglicki <lgryglicki@cncf.io>

Author: lukaszgryglicki

utils/find_1st_log_entry.sh

@@ -1,4 +1,6 @@
 #!/bin/bash
+# Copyright The Linux Foundation and each contributor to LFX.
+# SPDX-License-Identifier: MIT
 if [ -z "${STAGE}" ]
 then
   export STAGE=dev