[CMake] continuous build on a branch?

[Bram de Greve]

Hi,

How can I set up a continuous build on a branch?

I've tried setting CTEST_UPDATE_OPTIONS to include the branch name, but 
it keeps removing the stickyness and update to the main branch. 

set(CTEST_CVS_CHECKOUT "${CTEST_CVS_COMMAND} -d:pserver:foo at bar.com/baz 
co -r branchname foobar")
set(CTEST_UPDATE_OPTIONS "-dP -r branchname")

Thanks,
Bram