How to use multiple buildpacks in Auto-DevOps?

Background

I am trying to get the testing stage of Auto DevOps to run, but it needs to find headless Chrome. This issue is known: https://gitlab.com/gitlab-org/gitlab/issues/24843

Problem

Heruko explains how you can use multiple buildpacks:

So I thought, I could use https://elements.heroku.com/buildpacks/heroku/heroku-buildpack-google-chrome together with, as they say, https://github.com/heroku/heroku-buildpack-chromedriver and maybe an npm buildpack.

However, I can only set BUILDPACK_URL. How can I use the build pack in another way, so I can use multiple ones?

Okay hidden in the docs it says, this is just not supported:

Using multiple buildpacks isn’t fully supported by Auto DevOps because, when using the .buildpacks file, Auto Test will not work.

(highlighting by me)

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