Update .gitlab-ci.yml

.gitlab-ci.yml

@@ -7,6 +7,8 @@
 # Kaniko can build Docker images without using Docker-In-Docker and it's permission
 # drawbacks. No additional configuration required.
 kaniko-build:
+  tags:
+  - public-docker
   variables:
     # Additional options for Kaniko executor.
     # For more details see https://github.com/GoogleContainerTools/kaniko/blob/master/README.md#additional-flags