v17 is EOL, and anything but the most-recent point release of maintained branches is, at this point, known to have severe security issues (kernel). In my opinion, providing these images is a disservice.
In my opinion, providing image-builder "runnable" is an in-between non-solution. I don't see the advantages of these Docker images over something like the turn-key unattended upgrade servers which have the attention of the core development team. They're not a full build system, so they won't help with anything that someone clinging to EOLed 4/32 devices could use.
You should also consider the licensing issues, as, by posting them publicly, you are definitely distributing copyrighted material. You would need to abide by the terms of license, which includes at least GPL, and likely BSD-style, MIT, and more. Note that requirements for GPL do not cover the requirements of other licenses.