License header check ignore symlinks

The license header checks are failing when attempting to check symlinks
to directorires. This removes checks on symlinks altogether. This should
be fine even for links to files since even if the symlink is to a file
then presumably the linked file will be checked separately.

Author: rnro

.github/workflows/scripts/check-license-header.sh

@@ -53,6 +53,9 @@ file_paths=$(echo "$exclude_list" | xargs git ls-files)
 while IFS= read -r file_path; do
   file_basename=$(basename -- "${file_path}")
   file_extension="${file_basename##*.}"
+  if [[ -L "${file_path}" ]]; then
+    continue  # Ignore symbolic links
+  fi
 
   # shellcheck disable=SC2001 # We prefer to use sed here instead of bash search/replace
   case "${file_extension}" in