test3

.gitlab-ci.yml

 build:
-  image: docker:20.10.16
+  image: docker
+  services: 
+    - docker:dind
   stage: build
   variables:
     IMAGE_TAG: $CI_REGISTRY_IMAGE:$CI_COMMIT_REF_SLUG
@@ -7,3 +9,5 @@ build:
     - echo "IMAGE_TAG=" $IMAGE_TAG
     - echo "CI_REGISTRY=" $CI_REGISTRY
     - echo "CI_REGISTRY_USER=" $CI_REGISTRY_USER
+    - echo "CI_REGISTRY_PASSWORD=" $CI_REGISTRY_PASSWORD
+    - docker ps -a