container: call op method right before initial process

This is at a point considered to be already "within" the container. Daemons internal to the container can be started here.

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

container/initremount.go

@@ -26,6 +26,7 @@ func (*RemountOp) early(*setupState, syscallDispatcher) error { return nil }
 func (r *RemountOp) apply(state *setupState, k syscallDispatcher) error {
 	return k.remount(state, toSysroot(r.Target.String()), r.Flags)
 }
+func (r *RemountOp) late(*setupState, syscallDispatcher) error { return nil }
 
 func (r *RemountOp) Is(op Op) bool {
 	vr, ok := op.(*RemountOp)