llvm dev - Feb 2021 - No llvm-config.exe or LLVMConfig.cmake in pre-built Windows?

I have a downstream project that uses llvm. My project has used GitHub Actions
for CI for a long time on Linux and MacOS, and as I am trying to add Windows to
our CI tests, it seems that the pre-built Windows installations from
https://releases.llvm.org/ don't contain llvm-config.exe, nor any
LLVMConfig.cmake as far as I can tell. So my CMake build system is a little
lost.

How are the pre-built Windows LLVM installations expected to be found by CMake
find_package? What am I missing?

I'm trying to avoid building LLVM from scratch because I don't think I
can do it in a reasonable amount of CI time (and even if I could, it would be an
order of magnitude more time than building my downstream package and running its
extensive test suite).

How do other people address this issue?

--
Larry Gritz
lg at larrygritz.com