switch to dedicated kaniko repository for ci

.gitlab-ci.yml

@@ -18,7 +18,7 @@ buildimage:
     refs:
       - master
   image:
-    name: $CI_REGISTRY/j.hoerdt/sensor2graph/kaniko
+    name: $CI_REGISTRY/j.hoerdt/kaniko
     entrypoint: [""]
   script:
     - echo "{\"auths\":{\"$CI_REGISTRY\":{\"username\":\"$CI_REGISTRY_USER\",\"password\":\"$CI_REGISTRY_PASSWORD\"}}}" > /kaniko/.docker/config.json