I created a new app on the cedar-14 heroku stack, and it wouldn't run because it couldn't find the lua dependencies (eg lapis). When I downgraded to plain cedar, to see what would happen, it worked.

I noticed that when pushing the code, the cedar version has this:

remote: -----> Installing packages
remote:        
remote:        Missing dependencies for anonymous_app:
remote:        lustache 
remote:        lapis 

and subsequent installation, and the cedar-14 version does not. However, both versions install openresty fine (from url).