chore(piepline): add runtime package.

Signed-off-by: Bo-Yi Wu <appleboy.tw@gmail.com>

client/client.go

@@ -2,10 +2,15 @@ package client
 
 import (
 	"context"
+
+	v1 "gitea.com/gitea/proto/gen/proto/v1"
 )
 
 // A Client manages communication with the runner.
 type Client interface {
 	// Ping sends a ping message to the server to test connectivity.
 	Ping(ctx context.Context, machine string) error
+
+	// Request requests the next available build stage for execution.
+	Request(ctx context.Context) (*v1.Stage, error)
 }