Add support to build the documentation
Since we can't run valgrind tests on fedora 30 yet (see !125 (merged)), we build the nodebug variant with the F30 image and use the artifacts of that build to build the documentation and not the main one.
Since we can't run valgrind tests on fedora 30 yet (see !125 (merged)), we build the nodebug variant with the F30 image and use the artifacts of that build to build the documentation and not the main one.