Thanks for the effort putting a repeatable repo together for me. That saved me a ton of time.

Your Problem

I believe everything stems from your preference to have Laravel installed within a sub directory. Usually we just have everything in the root directory (see Financial Freedom)

More explanation

You have two .env files

1. /.env
2. /example-app/.env

You pass an .env with Docker

Why it doesn't work

Docker likely processes the command like this:

1. Pass .env to root
2. Docker sets your environment variables to the "root" session
3. As root, the su webuser is executed -- which runs a NEW session (not passing your variables)
4. Web user runs php artisan horizon with the /example-app/.env file (which defaults to 127.0.0.1)

How to confirm

I was able to get this to work as soon as I updated the /example-app/.env

✅ Suggested solution

• Do not put your Laravel app in a sub-directory. Instead, install it to the parent directory so you're only using one .env file