Thank you for continuing to add features to this. I set this up very early after you first released it, and now went to update it, following these instructions, and I got hit with a whole host of errors about variables not being set. I presume these are variables that are now required, that we're required before (HOST_DIR, etc.). Can I just use the sample variables you have in your post, or do I need to tinker and figure out my situation? Docker is a bit of a mystery to me, so that might take some doing.
UPDATE: The answer is no (and probably should have been obvious to me), you can't use the sample variables. I'm not sure how to even find out several of them (any of them having to do with Docker, really), so I reverted to my old settings. Sorry for my cluelessness.