Public subnet mandatory to tasks

[nataliasilva-hotmart]

In UI module we we have to inform public subnets, contrary to what the documentation asks, otherwise access through ALB doesn't work.

Also, we have just 2 variables to pass subnets, since we have to pass public ones to ALB work correctly, the tasks will run in public subnets with public IPs. It would be interesting to be able to inform private networks and not configure public ip in this case.