title: During heroku installation, where can I put things in the file system?
body: <p>I am trying to extract a repository (and I can't use a git submodule) into some location somewhere on the Heroku file system during the <code>preinstall</code> phase of a NodeJS deployment, but I can't find a permanent place where I have write access. Where can I write files during this phase that will be accessible to binary scripts I'll be running during runtime of the application?</p>