buildenv, cmd/gomoteserver: add LUCI project configuration

This change adds the configuration for the LUCI project gomote GCS
bucket.

For golang/go#61772

Change-Id: Ibfab47abae3d43831ad22d1076aaedd0165fd26d
Reviewed-on: https://go-review.googlesource.com/c/build/+/538676
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
Auto-Submit: Carlos Amedee <carlos@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>

buildenv/envs.go

@@ -295,9 +295,10 @@ var Production = &Environment{
 }
 
 var LUCIProduction = &Environment{
-	ProjectName:   "golang-ci-luci",
+	ProjectName:          "golang-ci-luci",
-	ProjectNumber: 257595674695,
+	ProjectNumber:        257595674695,
-	IsProd:        true,
+	IsProd:               true,
+	GomoteTransferBucket: "gomote-luci-transfer",
 }
 
 var Development = &Environment{
@@ -312,6 +313,7 @@ var possibleEnvs = map[string]*Environment{
 	"dev":                Development,
 	"symbolic-datum-552": Production,
 	"go-dashboard-dev":   Staging,
+	"golang-ci-luci":     LUCIProduction,
 }
 
 var (

cmd/gomoteserver/gomoteserver.go

@@ -60,8 +60,9 @@ func main() {
 		if err != nil {
 			log.Fatalf("metadata.ProjectID() = %v", err)
 		}
+		luciEnv := buildenv.ByProjectID("golang-ci-luci")
 		env := buildenv.ByProjectID(projectID)
-		gomoteBucket = env.GomoteTransferBucket
+		gomoteBucket = luciEnv.GomoteTransferBucket
 		var coordinatorBackend, serviceID = "coordinator-internal-iap", ""
 		if serviceID = env.IAPServiceID(coordinatorBackend); serviceID == "" {
 			log.Fatalf("unable to retrieve Service ID for backend service=%q", coordinatorBackend)