gopls/internal/debug: extend timeout when running under CI builders

I don't like this but I don't have a better idea.

Fixes  golang/go#73982

Change-Id: I8317d1ca8f325363169b83883a67428e36cc972c
Reviewed-on: https://go-review.googlesource.com/c/tools/+/680159
Auto-Submit: Alan Donovan <adonovan@google.com>
Reviewed-by: Robert Findley <rfindley@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>

Author: adonovan

gopls/internal/debug/flight.go

@@ -113,6 +113,13 @@ func startFlightRecorder() (http.HandlerFunc, error) {
 			return
 		}
 
+		// Some of the CI builders can be quite heavily loaded.
+		// Give them an extra grace period.
+		timeout := 10 * time.Second
+		if os.Getenv("GO_BUILDER_NAME") != "" {
+			timeout = 1 * time.Minute
+		}
+
 		select {
 		case addr := <-urlC:
 			// Success! Send a redirect to the new location.
@@ -122,8 +129,8 @@ func startFlightRecorder() (http.HandlerFunc, error) {
 		case <-r.Context().Done():
 			errorf("canceled")
 
-		case <-time.After(10 * time.Second):
-			errorf("trace viewer failed to start", err)
+		case <-time.After(timeout):
+			errorf("trace viewer failed to start within %v", timeout)
 		}
 	}, nil
 }