Fix Cloudflare Worker: use globalThis.process for safe env access

The Cloudflare Workers runtime does not define the process global at
module evaluation time, even with nodejs_compat_populate_process_env.
Use globalThis.process?.env?. with full optional chaining to safely
handle this, matching the pattern used by the SDK itself in
console_logger_transport.ts.

Author: tillrohrmann

packages/examples/cloudflare/src/index.ts

@@ -25,7 +25,7 @@ const greeter = restate.service({
 });
 
 const identityKeys =
-  process.env.RESTATE_IDENTITY_KEYS?.split(",").filter(Boolean);
+  globalThis.process?.env?.RESTATE_IDENTITY_KEYS?.split(",").filter(Boolean);
 
 export default {
   fetch: restate.createEndpointHandler({ services: [greeter], identityKeys }),