Update main.yaml

[Ayoub-HEDFI]

avoid Errors on new AWS Ubuntu AMIs, need to update_cache like sudo apt update before trying to install Nginx, if not it won't the find its package in apt,.... Thanks btw

[antonputra]

@Ayoub-HEDFI thanks for the PR, but

1. "Become: yes" is already set on the playbook here -

   tutorials/lessons/014/nginx.yaml

   Line 5 in 6032023

   become: yes

2. Also I would prefer to include "update_cache: yes" on the existing task rather then create a new one -

   tutorials/lessons/014/roles/nginx/tasks/main.yaml

   Line 8 in 6032023

   apt: