This is a component of our Heroku Button support.
Heroku doesn't normally deal much with binaries, so the best way for us to provision Vector onto a machine is to have it in a buildpack which can fetch and provision the binary to a known location, as well as do any prefetching of, say, a configuration from a URL.
Of course! The easiest way is to head over to the Vector readme's deploy section and follow along.
Otherwise, if you're feeling adventurous, maybe try adding this buildpack to your app.json? We'd love PRs to improve this feature.
If you just want to have a vector command available in your Heroku deployment for some other reason, well, we suggest you just curl -O ${URL} it in your build scripts!