- name: Deploy BlockScout
  hosts: localhost
  tasks:
   - name: Use role in loop
     include_role:
       name: main_software
     loop: "{{ chains.keys() }}"  
     loop_control:
       loop_var: chain
       index_var: index 
     environment:
       AWS_ACCESS_KEY_ID: "{{ aws_access_key }}"
       AWS_SECRET_ACCESS_KEY: "{{ aws_secret_key }}"
       AWS_REGION: "{{ region }}"