Add detection of k6 cloud run

LaunchOptions will ignore some options while running on the cloud.
CloudRun function is in the k6ext/cloud.go; in the future, we can add
more cloud related functionalities in the file. I didn't want to put it
in a generic file like helpers.go (anti-pattern).

Author: inancgumus

chromium/browser_type.go

@@ -132,7 +132,7 @@ func (b *BrowserType) Launch(opts goja.Value) api.Browser {
 		k6ext.Panic(ctx, "setting up logger: %w", err)
 	}
 
-	launchOpts := common.NewLaunchOptions(false)
+	launchOpts := common.NewLaunchOptions(k6ext.OnCloud())
 	if err := launchOpts.Parse(ctx, opts, b.logger); err != nil {
 		k6ext.Panic(ctx, "parsing launch options: %w", err)
 	}

k6ext/cloud.go

@@ -0,0 +1,9 @@
+package k6ext
+
+import "os"
+
+// OnCloud returns true if xk6-browser runs in the cloud.
+func OnCloud() bool {
+	_, ok := os.LookupEnv("K6_CLOUDRUN_INSTANCE_ID")
+	return ok
+}