Workers deploy button url renders a blank white page

I’m currently stuck trying to configure my repo for CF Workers deploy button. Previously I managed to get through entering Account ID and API Token form, but stuck on the next step after the deploy page asking me to enable Github action.

I checked my repo and realized the repo has been private on top of Github action for wrangler-action encountered error somehow. I tried fixed the problem after that and now instead stuck in Github action, CF deploy page gives me an empty white blank page instead. I tried switching from Edge to Chrome; clicking the deploy button URL is fine at first but after authorizing with Github, Chrome also gives me the blank white page.

URL of deploy button:
https://deploy.workers.cloudflare.com/?url=https://github.com/prognoveljs/prognovel-workers

My repo: