Use v1 auth to dockerhub

.gitlab-ci.yml

@@ -10,7 +10,7 @@ docker:
     entrypoint: [""]
   script:
     - mkdir -p /kaniko/.docker
-    - echo "{\"auths\":{\"registry.hub.docker.com\":{\"username\":\"$CI_REGISTRY_USERNAME\",\"password\":\"$CI_BUILD_TOKEN\"}}}" > /kaniko/.docker/config.json
+    - echo "{\"auths\":{\"https://index.docker.io/v1/\":{\"auth\":\"$CI_BUILD_TOKEN\"}}}" > /kaniko/.docker/config.json
     - /kaniko/executor --context $CI_PROJECT_DIR --dockerfile $CI_PROJECT_DIR/Dockerfile --destination $CI_REGISTRY_IMAGE:$CI_BUILD_REF_NAME
   only:
     - master