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She created a tutorial about Docker: https://github.com/giulia-berto/docker-tutorial , (here only the part 6 interests us).
To update an existing container, you first have to update the Dockerfile.
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Brainlife has its own Docker Hub, but it is possible for us to create our own Docker containers, push it to our own Docker Hub, and make our App running on Brainlife on this Docker container. Nevertheless, if we used a Docker hosted in the Brainlife Docker Hub, it will be maintained in the long term by Brainlife.
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