Update .gitlab-ci.yml file

.gitlab-ci.yml

@@ -2,6 +2,11 @@ include:
   - project: muni-kypo-images/ci-cd-virtual-images
     file: .gitlab-ci-template.yml  # for windows images use .gitlab-ci-template-windows.yml
 
+workflow:
+  rules:
+    - if: $CI_COMMIT_TAG
+      when: never
+
 variables:
   NAME: "kali"       # name of the file with packer configuration without .json
   TYPE: "linux"      # linux or windows