[#258] Add explicit expiration epoch

Signed-off-by: Denis Kirillov <denis@nspcc.ru>

cmd/authmate/main.go

@@ -5,6 +5,7 @@ import (
 	"crypto/ecdsa"
 	"encoding/json"
 	"fmt"
+	"math"
 	"os"
 	"os/signal"
 	"strings"
@@ -406,9 +407,10 @@ func createSDKClient(ctx context.Context, log *zap.Logger, key *ecdsa.PrivateKey
 	pb.AddNode(peerAddress, 1)
 
 	opts := &pool.BuilderOptions{
-		Key:                   key,
-		NodeConnectionTimeout: poolConnectTimeout,
-		NodeRequestTimeout:    poolRequestTimeout,
+		Key:                    key,
+		NodeConnectionTimeout:  poolConnectTimeout,
+		NodeRequestTimeout:     poolRequestTimeout,
+		SessionExpirationEpoch: math.MaxUint32,
 	}
 	return pb.Build(ctx, opts)
 }