Don't overwrite build.mk in CI
Since de890c82 we have been overwriting build.mk right before building. This was likely responsible for #19953 (closed), and perhaps more undiagnosed issues.
Backport of !6025 (closed)
Edited by Zubin
Since de890c82 we have been overwriting build.mk right before building. This was likely responsible for #19953 (closed), and perhaps more undiagnosed issues.
Backport of !6025 (closed)