Caching a single file on Travis CI

Inside my build on travis I need to first download a large .tar.gz file.

This .tar.gz never changes so it’s a good idea cache it.

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  • The .tar.gz it’s downloaded inside my Dockerfile:

    RUN curl -o /tmp/mylarge.tar.gz

    With that the docker container build with the file inside.

    How can I cache this file?

    PS: It’s also possible to download the file on before_install and use docker ADD to put it inside the Docker container.

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