docker: allow specifying version and channel to install #892
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I have a use case where I would need to specify the docker version/channel to install. This is related to a GitHub Action I maintain https://github.com/crazy-max/ghaction-setup-docker and specially docker/setup-docker-action#47.
With this change, user can set
DOCKER_INSTALL_VERSION
andDOCKER_INSTALL_CHANNEL
to install a specific version. This also returns the rightpkgFiles
based on the selected channel.