fix: Fixes to running on kubernetes

server/internal/auth/session.go

@@ -5,6 +5,7 @@ import (
 	"crypto/rand"
 	"encoding/hex"
 	"encoding/json"
+	"errors"
 	"time"
 
 	"github.com/redis/go-redis/v9"
@@ -41,6 +42,15 @@ func InitRedis(addr, username, password string) error {
 	return rdb.Ping(ctx).Err()
 }
 
+// PingRedis reports whether the session store is reachable. Readiness depends
+// on it: a pod that cannot reach Redis can authenticate nobody.
+func PingRedis(ctx context.Context) error {
+	if rdb == nil {
+		return errors.New("redis not initialised")
+	}
+	return rdb.Ping(ctx).Err()
+}
+
 func randomHex(n int) (string, error) {
 	b := make([]byte, n)
 	if _, err := rand.Read(b); err != nil {