Some of CI build targets are not compiled in parallel

[cngzhnp]

Describe your environment For example, when run ./ci/do_ci.sh cmake.maintainer.test on my local machine, it takes too much time to build from scratch.

Steps to reproduce
run ./ci/do_ci.sh cmake.maintainer.test

What is the expected behavior?
Target should be built with parallel option of make command if possible.

What is the actual behavior?
Some of targets in CI pipeline does not have any parallel options which takes too much time to build from scratch.

Additional context
Add any other context about the problem here.

[esigo]

We need to check if make -k works with -j.

[cngzhnp]

In my local environment, without parallel option it takes almost 9 minutes to build cmake.maintainer.test target.

With help of parallel build mechanism, it takes only around 2 minutes to build. So, in my opinion it works.

Do you think that should we also run tests in parallel?