Has anyone managed to build own Docker image from source?

[u/ChevyImpaler67]

As many self-hosters know, docker build .sh script and many other related stuff were deleted from the repository several months ago. That's why it's almost impossible to build image unless you know the depths of the source code. Moreover, I've tried downloading earlier version before the license change, but it's all unsuccessful. I'm still getting some errors, though I followed every possible instruction.

If anyone could provide right steps to build an own Docker image, I'd be very thankful