Simplify GPRC dial options

Author: awgreene

Diff for: pkg/controller/registry/grpc/source.go

@@ -147,13 +147,14 @@ func getEnvAny(names ...string) string {
 }
 
 func grpcConnection(address string) (*grpc.ClientConn, error) {
+	dialOptions := []grpc.DialOption{grpc.WithInsecure()}
 	proxyURL, err := grpcProxyURL(address)
 	if err != nil {
 		return nil, err
 	}
 
 	if proxyURL != nil {
-		return grpc.Dial(address, grpc.WithInsecure(), grpc.WithContextDialer(func(ctx context.Context, addr string) (net.Conn, error) {
+		dialOptions = append(dialOptions, grpc.WithContextDialer(func(ctx context.Context, addr string) (net.Conn, error) {
 			dialer, err := proxy.FromURL(proxyURL, &net.Dialer{})
 			if err != nil {
 				return nil, err
@@ -162,7 +163,7 @@ func grpcConnection(address string) (*grpc.ClientConn, error) {
 		}))
 	}
 
-	return grpc.Dial(address, grpc.WithInsecure())
+	return grpc.Dial(address, dialOptions...)
 }
 
 func (s *SourceStore) Add(key registry.CatalogKey, address string) (*SourceConn, error) {