Hi dear
Hey, Is there any progress? :)
I did some investigation though , but not tested it live yet
The phantomjs build pack you are using is pointing to a tar.gz file containing the phantomjs binaries
when unpacking this archive, it contain a mini linux file system on it
I think that if you updated this file system with what you need , and used this new archive insttead , it will work fine
This of course means that yoy need to create your own buildpack, which is easy, just fork phantomjs buildpack on git hub
upload your archive to aws s3, point the buildpack to that file , and then use this buildpack to create new apps