feat: Walkthrough and find hangups and bugs

[schristoff]

Recently, @squillace walked through using this and had some issues. One that stood out was there is a line that users uncomment that allows for a fmt.printf to run, but because the line is commented out then fmt package isn't in the file.

Also this is designed to work with Porter 1.0.1 which has the EOL debian:stretch issue, so we definitely need to update it to the
most recent Porter (bonus points if we can add into the Porter release pipeline to update what version Skeletor relies on!)

This repro just needs some good ole fashioned ❤️ - so I'm throwing a help-wanted tag on here and would encourage any discussion.