If you want one script that can build a whole stack then fine, but that doesn't mean you can't keep the tooling separate enough to build each component individu

If you want one script that can build a whole stack then fine, but that doesn't mean you can't keep the tooling separate enough to build each component individually. You use RethinkDB with a bunch of patches? Keep that part in it's own script that gets called by your big one, problem solved. Again, this isn't hard.