container: enter init path early

There is generally no use case where any setup is required before init, and requiring the explicit function call is error-prone and unnecessary. It also causes trouble with packages using a similar trick. This change moves argv0 check early and makes it an import side effect. The stub will be removed in v0.5.

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

container/initdaemon.go

@@ -2,7 +2,6 @@ package container
 
 import (
 	"context"
-	"encoding/gob"
 	"errors"
 	"fmt"
 	"os"
@@ -16,8 +15,6 @@ import (
 	"hakurei.app/fhs"
 )
 
-func init() { gob.Register(new(DaemonOp)) }
-
 const (
 	// daemonTimeout is the duration a [DaemonOp] is allowed to block before the
 	// [DaemonOp.Target] marker becomes available.