internal/app: check transmitted ops

This simulates params to shim and this is the last step before params to shim is merged.

Signed-off-by: Ophestra <cat@gensokyo.uk>

internal/app/spx11.go

@@ -1,6 +1,7 @@
 package app
 
 import (
+	"encoding/gob"
 	"errors"
 	"fmt"
 	"io/fs"
@@ -15,6 +16,8 @@ import (
 
 var absX11SocketDir = fhs.AbsTmp.Append(".X11-unix")
 
+func init() { gob.Register(new(spX11Op)) }
+
 // spX11Op exports the X11 display server to the container.
 type spX11Op struct {
 	// Value of $DISPLAY, stored during toSystem