Added docker auth to docker push job

.gitlab-ci.yml

@@ -61,6 +61,8 @@ image-2.7:
 
 image-latest:
   stage: release
+  before_script:
+    - docker login -u gitlab-ci-token -p $CI_BUILD_TOKEN $CI_REGISTRY
   script:
     - docker build -f Dockerfile . -t $CI_REGISTRY_IMAGE
     - docker tag $CI_REGISTRY_IMAGE $CI_REGISTRY_IMAGE:$CI_BUILD_REF_SLUG
@@ -68,4 +70,4 @@ image-latest:
     - docker push $CI_REGISTRY_IMAGE:$CI_BUILD_REF_SLUG
   only:
     - master
-    - triggers
+    - triggers
\ No newline at end of file