Add stderr logging to E2E plugin creation step

Capture and print stdout and stderr when the plugin creation command
fails, so that the actual error is visible in CI logs.

Signed-off-by: Patrik Oldsberg <poldsberg@gmail.com>
Made-with: Cursor

packages/e2e-test/src/commands/runCommand.ts

@@ -383,12 +383,22 @@ async function createPlugin(options: {
 
   try {
     let stdout = '';
+    let stderr = '';
     child.stdout?.on('data', (data: Buffer) => {
       stdout = stdout + data.toString('utf8');
     });
+    child.stderr?.on('data', (data: Buffer) => {
+      stderr = stderr + data.toString('utf8');
+    });
 
     print('Waiting for plugin create script to be done');
-    await child.waitForExit();
+    try {
+      await child.waitForExit();
+    } catch (error) {
+      print(`stdout: ${stdout}`);
+      print(`stderr: ${stderr}`);
+      throw error;
+    }
 
     const pluginDir = resolvePath(
       appDir,