Remove deploy stage, add release stage

.gitlab-ci.yml

@@ -26,9 +26,11 @@ test-gcc-version:
     - docker pull $CONTAINER_TEST_IMAGE
     - docker run $CONTAINER_TEST_IMAGE "arm-none-eabi-gcc -v"
 
-deploy:
-  stage: deploy
+release:
+  stage: release
   script:
-    - ./deploy.sh
+    - docker pull $CONTAINER_TEST_IMAGE
+    - docker tag $CONTAINER_TEST_IMAGE $CONTAINER_RELEASE_IMAGE
+    - docker push $CONTAINER_RELEASE_IMAGE
   only:
     - master