Enhanced update notifications

[bergundy]

Currently UI shows update notifications for the server, this is valuable for users to get notified when we make new releases and critical fixes.

Enhance this mechanism to show update notifications for the UI itself, Temporal CLI, and the SDKs.

Note that for Temporal CLI ideally we'd show notifications for those is own releases instead of separate notifications for the server and the UI.

[stevekinney]

I totally agree. Do we have a mechanism for getting notifications for new SDK versions like we do for the server?

[bergundy]

Not yet, we will need to add this.

[lorensr]

something like this?

GET https://temporal.download/versions/latest
{ 
  "cli": "0.5.0"
  "typescript": "1.6.0"
  ...
}

and the cloudflare worker would fetch latest version from the package manager? Like:

https://registry.npmjs.org/@temporalio/worker

[bergundy]

We'll want to integrate this with the server since it tracks the used SDK versions and we'd only want to show notifications for those.