Update .gitlab-ci.yml

.gitlab-ci.yml

@@ -24,6 +24,7 @@ build_image:
     - 'docker:18.09.7-dind'
   variables:
     IMAGE_TAG: $CI_REGISTRY_IMAGE:$CI_COMMIT_REF_SLUG
+    LATEST_TAG: $CI_REGISTRY_IMAGE:latest
   before_script:
     - ''
   script:
@@ -33,6 +34,6 @@ build_image:
     - rm pass.txt
     - docker push clarinpl/anonymizer
     - docker login -u $CI_REGISTRY_USER -p $CI_REGISTRY_PASSWORD $CI_REGISTRY
-    - docker build -t $IMAGE_TAG .
-    - docker push $IMAGE_TAG
+    - docker build -t $IMAGE_TAG -t $LATEST_TAG .
+    - docker push --all-tags $IMAGE_TAG