Comment (by Roland Haas):

To take away a bit of the sting in my rant: I am not actually against having such a docker image for download, as long is it is not the primary option and it is made clear on the website that this is provided without warranty or any guarantee of functionality.

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Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/2260/provide-compiled-et-code-on-tutorial