Update example yaml for 19.03 release changes

readme.md

@@ -26,6 +26,9 @@ build:
     - docker:dind
   before_script:
     - docker login -u "$CI_REGISTRY_USER" -p "$CI_REGISTRY_PASSWORD" $CI_REGISTRY
+    # Use docker-container driver to allow useful features (push/multi-platform)
+    - docker buildx create --driver docker-container --use
+    - docker buildx inspect --bootstrap    
   script:
     - update-binfmts --enable # Important: Ensures execution of other binary formats is enabled in the kernel
     - docker buildx build --platform linux/arm/v7,local --pull -t "$CI_REGISTRY_IMAGE" --push .