list: add role to s3 lists

fixes: #12

app/terraform/list/s3.py

@@ -20,14 +20,21 @@ class ListS3Automation(ListAutomation):
       }
     }
 
+    {% for list in lists %}
     provider "aws" {
       access_key = "{{ aws_access_key }}"
       secret_key = "{{ aws_secret_key }}"
-      region = "us-east-1"
+      region = "{{ list.branch }}"
+      {% if list.role %}
+      assume_role {
+        role_arn = "{{ list.role }}"
+      }
+      {% endif %}
+      alias = "list_{{ list.id }}"
     }
 
-    {% for list in lists %}
     resource "aws_s3_object" "object_{{ list.id }}" {
+      provider            = aws.list_{{ list.id }}
       bucket              = "{{ list.container }}"
       key                 = "{{ list.filename }}"
       source              = "{{ list.format }}.json"