fix(test): TestRunServer_FirstRunWithoutNameErrors hung on Ubuntu CI

The test passed 'nil' as the signal channel, assuming config.Resolve
would error out before the signal wait. On the GitHub Actions runner
that assumption didn't hold — something in the environment let
config.Resolve succeed (likely a pre-populated XDG_CONFIG_HOME), the
HTTP server booted for real, and <-nil blocks forever.

Defensive fix:
  * clear XDG_CONFIG_HOME so Dir() resolves strictly under the
    scratch HOME
  * pre-signal the channel so the server shuts down even if Resolve
    regresses in the future
  * bind to an ephemeral port so parallel tests don't collide on :3456

Author: Wiktor Starczewski

cmd/hearsay/main_test.go

@@ -567,7 +567,24 @@ func TestRunServer_BadFlagArgs(t *testing.T) {
 func TestRunServer_FirstRunWithoutNameErrors(t *testing.T) {
 	home := t.TempDir()
 	t.Setenv("HOME", home)
-	if code := runServerWithSignals([]string{"--bind", "127.0.0.1"}, nil); code != 1 {
+	// Neutralize any inherited XDG_CONFIG_HOME so Dir() resolves strictly
+	// under the scratch HOME. Without this, some CI images leave
+	// XDG_CONFIG_HOME set to a populated path and Resolve finds a
+	// pre-existing config there — the server then boots for real and,
+	// with a nil signal channel, the test hangs on `<-nil`.
+	t.Setenv("XDG_CONFIG_HOME", "")
+	// Belt-and-suspenders: pre-signal the channel so that if the
+	// no-name→error path ever regresses, the server shuts down instead
+	// of hanging the test for 10 minutes.
+	sigCh := make(chan os.Signal, 1)
+	sigCh <- syscall.SIGTERM
+	// Pick an ephemeral port so the default :3456 doesn't collide with
+	// other tests running in parallel on the same runner.
+	ln, _ := net.Listen("tcp", "127.0.0.1:0")
+	port := ln.Addr().(*net.TCPAddr).Port
+	ln.Close()
+	args := []string{"--bind", "127.0.0.1", "--port", fmt.Sprint(port), "--data-dir", t.TempDir(), "--quiet"}
+	if code := runServerWithSignals(args, sigCh); code != 1 {
 		t.Errorf("expected exit=1 when --name is missing on first run, got %d", code)
 	}
 }