gitlab-ci: switch to using registry env vars

.gitlab-ci.yml

@@ -8,11 +8,11 @@ stages:
 - release
 
 variables:
-  TEST_IMAGE: registry.gitlab.com/$CI_PROJECT_NAMESPACE/${CI_PROJECT_NAME}:$CI_BUILD_REF_NAME
-  RELEASE_IMAGE: registry.gitlab.com/$CI_PROJECT_NAMESPACE/${CI_PROJECT_NAME}:latest
+  TEST_IMAGE: ${CI_REGISTRY_IMAGE}:$CI_BUILD_REF_NAME
+  RELEASE_IMAGE: ${CI_REGISTRY_IMAGE}:latest
 
 before_script:
-  - docker login -u gitlab-ci-token -p $CI_BUILD_TOKEN registry.gitlab.com
+  - echo $CI_BUILD_TOKEN | docker login -u gitlab-ci-token --password-stdin ${CI_REGISTRY}
 
 build:
   stage: build
@@ -28,6 +28,7 @@ test:
 release:
   stage: release
   script:
+    - echo Publishing ${RELEASE_IMAGE}
     - docker pull $TEST_IMAGE
     - docker tag $TEST_IMAGE $RELEASE_IMAGE
     - docker push $RELEASE_IMAGE