add rocky9 to test

Author: goffinet

build-packer-templates.yaml

@@ -12,7 +12,7 @@
       - type: "redhat"
         flavor: "rocky"
         version: "9.4"
-        iso_url: "https://download.rockylinux.org/pub/rocky/9.4/isos/x86_64/"
+        iso_url: "https://download.rockylinux.org/pub/rocky/9.4/isos/x86_64"
         iso_name: "Rocky-9.4-x86_64-boot.iso "
         checksum_filename: "CHECKSUM"
       - type: "redhat"