It's actually not super hard, Unix has pretty good support for this, and a lot of companies have something like this internally. The gulf between "good enough for a company" and "good enough for the world" is pretty huge.
Plus, the extent to which people can't do this because they have no/have a terrible build system is generally underestimated.
Plus, the extent to which people can't do this because they have no/have a terrible build system is generally underestimated.