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Hi,
Going through the book right now, loving it so far! I wasn't familiar with the ENV syntax that was used in this Dockerfile, and when looking into the docs, the current used syntax is stated under "Alternative syntax" – but is discouraged and may be removed in a future release. Perhaps it's better to follow the latest way of providing the ENV instruction?
See more here: https://docs.docker.com/reference/dockerfile/#env
All the best!