tools: check for yq before using it

as get_from_kata_deps may be called from scripts that
does not install_yq

Signed-off-by: Snir Sheriber <ssheribe@redhat.com>

tools/packaging/scripts/lib.sh

@@ -36,6 +36,7 @@ get_from_kata_deps() {
 	local dependency="$1"
 	versions_file="${this_script_dir}/../../../versions.yaml"
 
+	command -v yq &> /dev/null || die 'yq command is not in your $PATH'
 	result=$("yq" read -X "$versions_file" "$dependency")
 	[ "$result" = "null" ] && result=""
 	echo "$result"