[CMake] [Cdash] Show results from the bullseye coverage in CDash

[David Cole]

When the coverage shows "0%" is there any indication that the 
ctest_submit for the coverage step failed? (i.e. do you log the output 
of ctest, and does it show anything about failing to submit?)

That's another type of intermittent network blip that I see, where 
there's a successful local build, but the submit of a piece of the 
dashboard fails occasionally.


D