Unable to host Botpress on Heroku using Docker

Hi,

So far I have followed all the instruction to the word in the documentation.

Please point out where I am going wrong.

CLI:
C:\WINDOWS\system32>heroku create myra-healthcare-companion
Creating ⬢ myra-healthcare-companion… done
https://myra-healthcare-companion.herokuapp.com/ | https://git.heroku.com/myra-healthcare-companion.git

C:\WINDOWS\system32>heroku container:login
Login Succeeded

C:\WINDOWS\system32>heroku container:push web --app myra-healthcare-companion
! No images to push

C:\WINDOWS\system32>heroku container:release web --app myra-healthcare-companion
! Expected response to be successful, got 404