Fix default env processing typescript error

packages/worker/src/environment.ts

@@ -89,7 +89,7 @@ for (let [key, value] of Object.entries(environment)) {
   // handle the edge case of "0" to disable an environment variable
   if (value === "0") {
     // @ts-ignore
-    env[key] = 0
+    environment[key] = 0
   }
 }