As you may have seen, Apple released Xcode 12.0.1 on Thursday 24 September, but to date there is no direct download on Apple’s developer software portal. As such, it appears this was an App Store only release - quite a rare occurrence!
The release notes on the App Store update state the following:
This update fixes an issue that could cause Xcode to crash when viewing documentation
As this appears to be the only change, it appears immaterial for CI environments, so continuing to build and release your apps with 12.0.0 will be perfectly fine.
We will keep an eye out for 12.0.1 being released for direct download and when/if it is we will create a new image in due course.
Meanwhile, Happy Building!