Update heroku.md (#1075)

* Update heroku.md

I faced this error while following the commands.

* copy edit

* Update formatting (merge with prev. line)

* Update formatting (merge 2 lines)

Co-authored-by: Gabriel <[email protected]>
Co-authored-by: Pierre Wizla <[email protected]>

Author: 3 people

docs/developer-docs/latest/setup-deployment-guides/deployment/hosting-guides/heroku.md

@@ -415,6 +415,10 @@ git push heroku HEAD:main
 heroku open
 ```
 
+::: tip
+If you see the following issue while running the `git push` command: `'heroku' does not appear to be a git repository`, run the following command: `heroku git:remote -a your-app-name`.
+:::
+
 ## File Uploads
 
 Like with project updates on Heroku, the file system doesn't support local uploading of files as they will be wiped when Heroku "cycles" the dyno. This type of file system is called [ephemeral](https://devcenter.heroku.com/articles/dynos#ephemeral-filesystem), which means the file system only lasts until the dyno is restarted (with Heroku this happens any time you redeploy or during their regular restart which can happen every few hours or every day).