Wait 50ms before exit to fix libuv bug (#689)

Fixes: #686

Author: eifinger

dist/save-cache/index.js

@@ -26,6 +26,9 @@ export async function run(): Promise<void> {
       } else {
         core.info("save-cache is false. Skipping save cache step.");
       }
+      // https://github.com/nodejs/node/issues/56645#issuecomment-3077594952
+      await new Promise((resolve) => setTimeout(resolve, 50));
+
       // node will stay alive if any promises are not resolved,
       // which is a possibility if HTTP requests are dangling
       // due to retries or timeouts. We know that if we got here

dist/setup/index.js

@@ -66,6 +66,8 @@ async function run(): Promise<void> {
     if (enableCache) {
       await restoreCache();
     }
+    // https://github.com/nodejs/node/issues/56645#issuecomment-3077594952
+    await new Promise((resolve) => setTimeout(resolve, 50));
     process.exit(0);
   } catch (err) {
     core.setFailed((err as Error).message);