Update tools/kolla-images.py

Author: jovial

tools/kolla-images.py

@@ -227,7 +227,7 @@ def get_openstack_release() -> str:
 
 def validate(kolla_image_tags: KollaImageTags):
     """Validate the kolla_image_tags variable."""
-    tag_var_re = re.compile(r"^[a-z0-9_]+$")
+    tag_var_re = re.compile(r"^[a-z0-9_-]+$")
     openstack_release = get_openstack_release()
     tag_res = get_distro_regex_map(openstack_release)
     errors = []