Change docker push to gitlab registry

.gitlab-ci.yml

@@ -20,13 +20,12 @@ build_image:
   image: 'docker:18.09.7'
   only:
     - master
+    - gitlab-registry
   services:
     - 'docker:18.09.7-dind'
   before_script:
     - ''
   script:
-    - docker build -t clarinpl/omwn .
-    - echo $DOCKER_PASSWORD > pass.txt
-    - cat pass.txt | docker login --username $DOCKER_USERNAME --password-stdin
-    - rm pass.txt
-    - docker push clarinpl/omwn
+    - docker build -t $CI_REGISTRY_IMAGE .
+    - docker login -u $CI_REGISTRY_USER -p $CI_REGISTRY_PASSWORD $CI_REGISTRY
+    - docker push $CI_REGISTRY_IMAGE
\ No newline at end of file