e2e: Capture logs from Go services

.github/workflows/web-test-e2e.yml

@@ -129,3 +129,10 @@ jobs:
           name: ${{ matrix.name }}-playwright-report
           path: ${{ matrix.name }}/playwright-report/
           retention-days: 30
+
+      - uses: actions/upload-artifact@v4
+        if: always() && matrix.name == 'web-admin'
+        with:
+          name: web-admin-services-log
+          path: web-admin/playwright/logs/admin-runtime.log
+          retention-days: 30

web-admin/tests/setup/setup.ts

@@ -1,14 +1,16 @@
 import { chromium, expect } from "@playwright/test";
+import {
+  execAsync,
+  spawnAndMatch,
+} from "@rilldata/web-common/tests/utils/spawn";
 import axios from "axios";
 import { spawn } from "child_process";
 import dotenv from "dotenv";
+import { openSync } from "fs";
+import { mkdir } from "fs/promises";
 import path from "path";
 import { fileURLToPath } from "url";
 import { writeFileEnsuringDir } from "../utils/fs";
-import {
-  execAsync,
-  spawnAndMatch,
-} from "@rilldata/web-common/tests/utils/spawn";
 import type { StorageState } from "../utils/storage-state";
 import { test as setup } from "./base";
 import {
@@ -61,6 +63,11 @@ setup.describe("global setup", () => {
       );
     }
 
+    // Setup a log file to capture the output of the admin and runtime services
+    await mkdir("playwright/logs", { recursive: true });
+    const logPath = path.resolve("playwright/logs/admin-runtime.log");
+    const logFd = openSync(logPath, "w");
+
     // Start the admin and runtime services in a detached background process.
     // A detached process ensures they are not cleaned up when this setup project completes.
     // However, we need to be sure to clean-up the processes manually in the teardown project.
@@ -69,10 +76,12 @@ setup.describe("global setup", () => {
       ["devtool", "start", "e2e", "--only", "admin,runtime"],
       {
         detached: true,
-        stdio: "ignore",
+        stdio: ["ignore", logFd, logFd],
         cwd: repoRoot,
       },
     );
+    child.unref();
+
     // Write the pid to a file, so I can kill it later
     if (child.pid) {
       writeFileEnsuringDir(