CMAKE_TLS_VERIFY
From Get docs
Cmake/docs/3.21/variable/cmake tls verify
CMAKE_TLS_VERIFY
Specify the default value for the file(DOWNLOAD) and file(UPLOAD) commands' TLS_VERIFY
options. If not set, the default is off.
This setting is also used by the ExternalProject module for internal calls to file(DOWNLOAD).
TLS verification can help provide confidence that one is connecting to the desired server. When downloading known content, one should also use file hashes to verify it.
set(CMAKE_TLS_VERIFY TRUE)
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https://cmake.org/cmake/help/v3.21/variable/CMAKE_TLS_VERIFY.html