I'm currently using Heroku Pipeline feature for automatically detecting, building and deploying pull requests for review.
✓ Create new review apps for new pull requests automatically
URL pattern Pattern: Random pipeline-xxxxxx-xxxxxx.herokuapp.com
The problem is that my app needs a combination of 2 buildpacks in a specific order in order to boot properly.
The main/production app has this settings and it works fine(e.g. after each time a PR is merged).
From what I see Review Apps doesn't have a concept of buildpack settings and it tries to autodetect it each time.
What I've tried:
Open the latest Review App, set buildpacks, rebuild or push a new commit. It works fine in that Pull Request/branch/Review App but for each new PR this process has to be repeated manually.
Is there any way to overcome this issue?
In case you have a similar issue, one approach that you can use(that worked for me)
app.jsonHeroku's convention file where you can list your buildpacks among many other settings.