add amazon storage config (#438)

Author: Mariam05

config/storage.yml

@@ -36,12 +36,12 @@ mirror:
   mirrors: [ <%= ENV['AS_MIRROR_SECONDARY'] %> ]
 
 # Use rails credentials:edit to set the AWS secrets (as aws:access_key_id|secret_access_key)
-# amazon:
-#   service: S3
-#   access_key_id: <%= Rails.application.credentials.dig(:aws, :access_key_id) %>
-#   secret_access_key: <%= Rails.application.credentials.dig(:aws, :secret_access_key) %>
-#   region: us-east-1
-#   bucket: your_own_bucket
+amazon:
+  service: S3
+  access_key_id: <%= ENV['S3_ACCESS_KEY_ID'] %>
+  secret_access_key: <%= ENV['S3_SECRET_ACCESS_KEY'] %>
+  region: <%= ENV['S3_REGION'] %>
+  bucket: <%= ENV['S3_BUCKET'] %>
 
 # Use rails credentials:edit to set the Azure Storage secret (as azure_storage:storage_access_key)
 # microsoft: