Update frontmatter.sh

Signed-off-by: Stavros Kois <47820033+stavros-k@users.noreply.github.com>

.github/scripts/frontmatter.sh

@@ -1,6 +1,6 @@
 #!/bin/bash
 
-file_path=$1
+file_path="$1"
 base_cmd="yq --front-matter=process"
 # Check if the file has valid front matter