Add optional S3 config/backend for ActiveStorage

config/storage.yml

@@ -5,3 +5,13 @@ local:
 test:
   service: Disk
   root: <%= Rails.root.join("tmp/storage") %>
+
+<% if ENV["S3_ENABLED"] %>
+s3:
+  service: S3
+  endpoint: ENV["S3_ENDPOINT"]
+  region: ENV["S3_REGION"]
+  bucket: ENV["S3_BUCKET"]
+  access_key_id: ENV["S3_ACCESS_KEY"]
+  secret_access_key: ENV["S3_SECRET_KEY"]
+<% end %>