internal/relui/protos: add protos to relui

This change adds protos for release artifact signing.

Updates golang/go#54303

Change-Id: I9ff6645177a4b300023f842874fc8c2acb754c72
Reviewed-on: https://go-review.googlesource.com/c/build/+/420801
Reviewed-by: Heschi Kreinick <[email protected]>
Reviewed-by: Dmitri Shuralyov <[email protected]>
Reviewed-by: Dmitri Shuralyov <[email protected]>
Reviewed-by: Jenny Rakoczy <[email protected]>

Author: cagedmantis

internal/relui/protos/proto.go

@@ -0,0 +1,14 @@
+// Copyright 2022 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package protos
+
+// Run "go generate" in this directory to update. You need to have:
+//
+// a protoc binary (see https://github.com/protocolbuffers/protobuf/releases)
+// protocol compiler plugins for Go:
+// go install google.golang.org/protobuf/cmd/[email protected]
+// go install google.golang.org/grpc/cmd/[email protected]
+
+//go:generate protoc --go_out=. --go_opt=paths=source_relative --go-grpc_out=. --go-grpc_opt=paths=source_relative relui.proto