build: mark result context build as internal

Signed-off-by: CrazyMax <crazy-max@users.noreply.github.com>

Author: crazy-max

build/result.go

@@ -75,6 +75,7 @@ func getResultAt(ctx context.Context, c *client.Client, solveOpt client.SolveOpt
 	go func() {
 		solveOpt := solveOpt
 		solveOpt.Ref = ""
+		solveOpt.Internal = true
 		buildDoneCh := make(chan struct{})
 		_, err := c.Build(context.Background(), solveOpt, "buildx", func(ctx context.Context, c gateway.Client) (*gateway.Result, error) {
 			doneErr := errors.Errorf("done")