fatal: Not a git repository ... error message

ruby-on-rails git heroku push

You need to do a git init in your project to initialize a git repository. You can see heroku configuration in the following link git remote doesn't seem to be working at all.

ruby-on-rails git heroku push

This is really really late but you should try this:

heroku labs:enable user-env-compile

run that in the console and then update your repo. Then push to github... Then push to heroku. Good luck

ruby-on-rails git heroku push

Compiling the assets locally then push to heroku worked for me.

CodeHunter