internal/relui: add output that registers CreateUpdateStdlibIndexCL

For golang/go#54377

Change-Id: I7a2a4f3592a9386faa3ebc63df1b6dbbc1c6c0a2
Reviewed-on: https://go-review.googlesource.com/c/build/+/448715
TryBot-Result: Gopher Robot <[email protected]>
Run-TryBot: Dylan Le <[email protected]>
Reviewed-by: Heschi Kreinick <[email protected]>

Author: Dung Le

internal/relui/buildrelease_test.go

@@ -45,6 +45,9 @@ func TestRelease(t *testing.T) {
 	t.Run("rc", func(t *testing.T) {
 		testRelease(t, "go1.18rc1", task.KindRC)
 	})
+	t.Run("major", func(t *testing.T) {
+		testRelease(t, "go1.18", task.KindMajor)
+	})
 }
 
 func TestSecurity(t *testing.T) {

internal/relui/workflows.go

@@ -393,7 +393,8 @@ func addSingleReleaseWorkflow(
 	pushed := wf.Action3(wd, "Push issues", milestone.PushIssues, milestones, nextVersion, kindVal, wf.After(tagged))
 	versionPublished = wf.Task2(wd, "Publish to website", build.publishArtifacts, nextVersion, signedAndTestedArtifacts, wf.After(uploaded, pushed))
 	if kind == task.KindMajor {
-		wf.Task3(wd, fmt.Sprintf("Mail update stdlib index CL for 1.%d", major), version.CreateUpdateStdlibIndexCL, wf.Const("master"), coordinators, versionPublished)
+		updateStdlibIndexCL := wf.Task3(wd, fmt.Sprintf("Mail update stdlib index CL for 1.%d", major), version.CreateUpdateStdlibIndexCL, wf.Const("master"), coordinators, versionPublished)
+		wf.Output(wd, "Stdlib regeneration CL", updateStdlibIndexCL)
 	}
 	wf.Output(wd, "Released version", versionPublished)
 	return versionPublished