I have been doing exactly this by bookmarking Codex and using 'Add to home screen'

Process (all on my phone)

* Create new repo on github

* Tell Chatgpt the project and ask for a readme and agents file

* Manual upload the files to github

* Go to Codex and tell it to review the code and carry out steps in readme

* Connect project to Vercel

* If needed, create a DB

* Ask ChatGPT for the schema and run the sql

I have done this kind of work for years and now I can create things like this on the way back from a meeting. It's broken my business model by the way.

Here is one of the apps, for mental health - pretty much all done on my phone.

https://you-are-ok.vercel.app/

So having Codex in app removes one little barrier and I will take that.