Have CI release a build suitable for VS-code users

[rikkimax]

As a follow-up to @ryuukk's post on D.learn, it would be good to have build artifacts uploaded automatically to GH (the current CI deletes artifacts so there are none right now).

[vladimmi]

I would also add that building mago-mi manually in recent VS somehow failed for me with lots of unresolved includes and libraries. So having binary release can be even more important.