Use default kaniko image config from template

.gitlab-ci.yml

@@ -23,11 +23,6 @@ default:
 
 ci_test_image:
   stage: build
-  image:
-    # We need a shell to provide the registry credentials, so we need to use the
-    # kaniko debug image (https://github.com/GoogleContainerTools/kaniko#debug-image)
-    name: gcr.io/kaniko-project/executor:debug
-    entrypoint: [""]
   only:
     changes:
       - .gitlab-ci.yml