add note about missing arm support

Author: nicktrn

docs/v3/open-source-self-hosting.mdx

@@ -15,6 +15,8 @@ You're going to need at least one Debian (or derivative) machine with Docker and
 
 ## Caveats
 
+<Note>The v3 worker components don't have ARM support yet.</Note>
+
 This guide outlines a quick way to start self-hosting Trigger.dev. Scaling, security, and reliability concerns are not fully addressed here. It's unlikely to result in a production-ready deployment on its own, but it's a good starting point.
 
 As self-hosted deployments tend to have unique requirements and configurations, we don't provide specific advice for scaling up or improving security and reliability.