Heroku: Git error after application fork

Question

Setup:

I have a Node.js (MEAN fullstack) application (ie. myApp) deployed on heroku that works fine. I deploy with standard git push

$ git push heroku master

I wanted to create a staging replica of the application and used heroku fork to do so (as per https://devcenter.heroku.com/articles/fork-app) .

$ heroku fork -a myApp myApp-staging

The staging application also works fine with its' own database and has its' own set of config variables (es expected). !!! IMPORTANT

I also created a new git remote

$ git remote add staging [email protected]:myApp-staging.git
// repo address taken from "heroku info -a myApp-staging"

Problem:

1) If I try to push to production ie. "git push heroku master" it works fine.

2) If I try to push to staging

$ git push staging master

I get "Permission denied (publickey)."
3) If I try to clone my staging application git repo to another directory I get an empty repo

$ heroku git:clone -a industryhub-staging
// warning: You appear to have cloned an empty repository

Where is my staging repo? Which code is Heroku running on my staging instance? An finally - how do I push to staging?

Answer 1

Figured it out. Here for posterity.

The error was the wrong remote for the staging app. I created it with

$ git remote add staging [email protected]:myApp-staging.git

and I had

$ git remote -v
heroku  https://git.heroku.com/myApp.git (fetch)
heroku  https://git.heroku.com/myApp.git (push)
staging [email protected]:myApp-staging.git (fetch) // wrong
staging [email protected]:myApp-staging.git (push)  // wrong

I should have done

$ git remote add staging https://git.heroku.com/myApp-staging.git // over https

Now my git shows

$ git remote -v
heroku  https://git.heroku.com/myApp.git (fetch)
heroku  https://git.heroku.com/myApp.git (push)
staging https://git.heroku.com/myApp-staging.git (fetch) // OK
staging https://git.heroku.com/myApp-staging.git (push)  // OK

And the life is peachy again!

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Note: Heroku says that the new repo IS EMPTY after forking an app. https://devcenter.heroku.com/articles/fork-app#forked-app-state