MSc in education for an assistnat professor in computer science
More important that what we think is what your university thinks and how it will impact your career. It sounds like that value it pretty highly. There is nothing magic in a PhD that makes you an adequate teacher of your subject. 

If you intend to stay at your current place and build your career there then it might be worth any effort. Likewise if you want teaching to be an important part of your academic life it has value. 

And your current place seems to require at least part of it, so, ...