vercel-rust: set cargo metadata to run in workPath (#111)

* vercel-rust: set cargo metadata to run in workPath

* bump version number

Author: isaacharrisholt

package.json

@@ -1,6 +1,6 @@
 {
   "name": "vercel-rust",
-  "version": "4.0.2",
+  "version": "4.0.3",
   "description": "Rust runtime for Vercel Functions.",
   "homepage": "https://github.com/vercel-community/rust",
   "repository": {

src/index.ts

@@ -84,7 +84,7 @@ async function buildHandler(
   debug(`Building \`${binaryName}\` for \`${process.platform}\` completed`);
 
   let { target_directory: targetDirectory } = await getCargoMetadata({
-    cwd: process.cwd(),
+    cwd: workPath,
     env: rustEnv,
   });