Fix dev indexing (#2094)

* save build manifest for dev runs again

* add changeset

Author: nicktrn

.changeset/big-carrots-fail.md

@@ -0,0 +1,5 @@
+---
+"trigger.dev": patch
+---
+
+Fix dev runs

packages/cli-v3/src/dev/backgroundWorker.ts

@@ -47,6 +47,9 @@ export class BackgroundWorker {
       throw new Error("Worker already initialized");
     }
 
+    // Write the build manifest to this.build.outputPath/build.json
+    await writeJSONFile(this.buildManifestPath, this.build, true);
+
     logger.debug("indexing worker manifest", { build: this.build, params: this.params });
 
     this.manifest = await indexWorkerManifest({