I have a Rails/Yarn app that I’m trying out on the App Platform, which is working fine - both the nodejs and ruby buildpacks run:
4 of 5 buildpacks participating heroku/nodejs-engine 0.5.1 heroku/ruby 0.230.3 digitalocean/ruby-appdetect 0.0.2 digitalocean/procfile 0.0.3
Bundler appears to cache the ruby gems, which is excellent, as the install times (for everything except the first deploy) are very quick. I see:
-----> Loading Bundler Cache
and then all the gems install in a matter of seconds.
However, the same doesn’t appear to happen for Yarn/Node - there’s no equivalent “loading cache” line for Yarn, and I infer all the modules install from scratch, as they take some time on every deploy:
[5/5] Building fresh packages... Done in 385.20s.
Is there a way I can cache the Yarn packages for faster deploys? (I’m also a little confused as to the App Platform/Heroku Buildpacks relationship - what elements of the Heroku Buildpacks apply here - is that the documentation I should be reading to try to find these kind of answers?)