need a proper way to change the bucket

Good day!

I tried to make the next experiment.

I had a working ObjectStore with a proper schedule.

```yaml
apiVersion: postgresql.cnpg.io/v1
kind: ScheduledBackup
metadata:
name: keycloakdb-daily
namespace: keycloak
spec:
backupOwnerReference: self
cluster:
name: keycloakdb
method: plugin
pluginConfiguration:
name: barman-cloud.cloudnative-pg.io
schedule: 0 2 * * *
```

```yaml
apiVersion: barmancloud.cnpg.io/v1
kind: ObjectStore
metadata:
name: keycloak
namespace: keycloak
spec:
configuration:
data:
compression: gzip
jobs: 2
destinationPath: s3://[mybucketname]/
endpointURL: https://storage.yandexcloud.net
s3Credentials:
accessKeyId:
key: AWS_ACCESS_KEY_ID
name: s3-yandex
secretAccessKey:
key: AWS_SECRET_ACCESS_KEY
name: s3-yandex
wal:
compression: zstd
maxParallel: 8
```

Now I want to change:
- bucketname to another one
- and appropriately change the `AWS_ACCESS_KEY_ID` and `AWS_SECRET_ACCESS_KEY`

So I naively changing the content of the `s3-yandex` secret and apply the corrected `ObjectStore`. But.... nothing happens.

I see the next in the logs of barman:

```
{"level":"info","ts":"2025-06-13T11:30:07.452298887Z","msg":"Skipping retention policy enforcement, no retention policy specified","logging_pod":"keycloakdb-1"}
{"level":"info","ts":"2025-06-13T11:35:11.141188431Z","msg":"Skipping retention policy enforcement, no retention policy specified","logging_pod":"keycloakdb-1"}
{"level":"info","ts":"2025-06-13T11:40:14.628910791Z","msg":"Skipping retention policy enforcement, no retention policy specified","logging_pod":"keycloakdb-1"}
{"level":"info","ts":"2025-06-13T11:45:18.580604564Z","msg":"Skipping retention policy enforcement, no retention policy specified","logging_pod":"keycloakdb-1"}
{"level":"info","ts":"2025-06-13T11:50:21.684530075Z","msg":"Skipping retention policy enforcement, no retention policy specified","logging_pod":"keycloakdb-1"}
{"level":"info","ts":"2025-06-13T11:55:13.513036839Z","msg":"Executing barman-cloud-wal-archive","logging_pod":"keycloakdb-1","walName":"/var/lib/postgresql/data/pgdata/pg_wal/0000000100000003000000AF","options":["--zstd","--endpoint-url","https://storage.yandexcloud.net","--cloud-provider","aws-s3","s3://testcloudnative/","keycloakdb","/var/lib/postgresql/data/pgdata/pg_wal/0000000100000003000000AF"]}
{"level":"info","ts":"2025-06-13T11:55:16.342916796Z","msg":"Archived WAL file","logging_pod":"keycloakdb-1","walName":"/var/lib/postgresql/data/pgdata/pg_wal/0000000100000003000000AF","startTime":"2025-06-13T11:55:13.512903992Z","endTime":"2025-06-13T11:55:16.34287209Z","elapsedWalTime":2.829968224}
{"level":"info","ts":"2025-06-13T11:55:25.139734503Z","msg":"Skipping retention policy enforcement, no retention policy specified","logging_pod":"keycloakdb-1"}
{"level":"info","ts":"2025-06-13T12:00:13.96310529Z","msg":"Executing barman-cloud-wal-archive","logging_pod":"keycloakdb-1","walName":"/var/lib/postgresql/data/pgdata/pg_wal/0000000100000003000000B0","options":["--zstd","--endpoint-url","https://storage.yandexcloud.net","--cloud-provider","aws-s3","s3://testcloudnative/","keycloakdb","/var/lib/postgresql/data/pgdata/pg_wal/0000000100000003000000B0"]}
{"level":"info","ts":"2025-06-13T12:00:16.812934587Z","msg":"Archived WAL file","logging_pod":"keycloakdb-1","walName":"/var/lib/postgresql/data/pgdata/pg_wal/0000000100000003000000B0","startTime":"2025-06-13T12:00:13.963073964Z","endTime":"2025-06-13T12:00:16.812896472Z","elapsedWalTime":2.849822661}
{"level":"info","ts":"2025-06-13T12:00:28.490192702Z","msg":"Skipping retention policy enforcement, no retention policy specified","logging_pod":"keycloakdb-1"}
{"level":"info","ts":"2025-06-13T12:05:13.279134066Z","msg":"Executing barman-cloud-wal-archive","logging_pod":"keycloakdb-1","walName":"/var/lib/postgresql/data/pgdata/pg_wal/0000000100000003000000B1","options":["--zstd","--endpoint-url","https://storage.yandexcloud.net","--cloud-provider","aws-s3","s3://testcloudnative/","keycloakdb","/var/lib/postgresql/data/pgdata/pg_wal/0000000100000003000000B1"]}
{"level":"info","ts":"2025-06-13T12:05:15.905317755Z","msg":"Archived WAL file","logging_pod":"keycloakdb-1","walName":"/var/lib/postgresql/data/pgdata/pg_wal/0000000100000003000000B1","startTime":"2025-06-13T12:05:13.278914875Z","endTime":"2025-06-13T12:05:15.905254787Z","elapsedWalTime":2.62633958}
{"level":"info","ts":"2025-06-13T12:05:32.282742702Z","msg":"Skipping retention policy enforcement, no retention policy specified","logging_pod":"keycloakdb-1"}
{"level":"info","ts":"2025-06-13T12:10:35.701574771Z","msg":"Skipping retention policy enforcement, no retention policy specified","logging_pod":"keycloakdb-1"}
{"level":"info","ts":"2025-06-13T12:15:38.925811524Z","msg":"Skipping retention policy enforcement, no retention policy specified","logging_pod":"keycloakdb-1"}
{"level":"info","ts":"2025-06-13T12:20:42.222088847Z","msg":"Skipping retention policy enforcement, no retention policy specified","logging_pod":"keycloakdb-1"}
{"level":"info","ts":"2025-06-13T12:20:44.612536625Z","msg":"Deleting backup not in the catalog","logging_pod":"keycloakdb-1","backup":"keycloakdb-daily-20250612230200"}
{"level":"info","ts":"2025-06-13T12:20:44.620135745Z","msg":"Deleting backup not in the catalog","logging_pod":"keycloakdb-1","backup":"keycloakdb-daily-20250613000200"}
{"level":"info","ts":"2025-06-13T12:20:44.626424912Z","msg":"Deleting backup not in the catalog","logging_pod":"keycloakdb-1","backup":"keycloakdb-daily-20250613010200"}
{"level":"info","ts":"2025-06-13T12:20:44.633155459Z","msg":"Deleting backup not in the catalog","logging_pod":"keycloakdb-1","backup":"keycloakdb-daily-20250613020200"}
{"level":"info","ts":"2025-06-13T12:20:44.638740297Z","msg":"Deleting backup not in the catalog","logging_pod":"keycloakdb-1","backup":"keycloakdb-daily-20250613030200"}
{"level":"info","ts":"2025-06-13T12:20:44.646144456Z","msg":"Deleting backup not in the catalog","logging_pod":"keycloakdb-1","backup":"keycloakdb-daily-20250613040200"}
{"level":"info","ts":"2025-06-13T12:20:44.652175408Z","msg":"Deleting backup not in the catalog","logging_pod":"keycloakdb-1","backup":"keycloakdb-daily-20250613050200"}
{"level":"info","ts":"2025-06-13T12:20:44.659974535Z","msg":"Deleting backup not in the catalog","logging_pod":"keycloakdb-1","backup":"keycloakdb-daily-20250613060200"}
{"level":"info","ts":"2025-06-13T12:20:44.665997349Z","msg":"Deleting backup not in the catalog","logging_pod":"keycloakdb-1","backup":"keycloakdb-daily-20250613070200"}
{"level":"info","ts":"2025-06-13T12:20:44.671859722Z","msg":"Deleting backup not in the catalog","logging_pod":"keycloakdb-1","backup":"keycloakdb-daily-20250613080200"}
{"level":"info","ts":"2025-06-13T12:20:44.678399927Z","msg":"Deleting backup not in the catalog","logging_pod":"keycloakdb-1","backup":"keycloakdb-daily-20250613090200"}
{"level":"info","ts":"2025-06-13T12:20:44.685202587Z","msg":"Deleting backup not in the catalog","logging_pod":"keycloakdb-1","backup":"keycloakdb-daily-20250613100200"}
{"level":"info","ts":"2025-06-13T12:20:44.692265438Z","msg":"Deleting backup not in the catalog","logging_pod":"keycloakdb-1","backup":"keycloakdb-daily-20250613110200"}
{"level":"info","ts":"2025-06-13T12:20:44.699563098Z","msg":"Deleting backup not in the catalog","logging_pod":"keycloakdb-1","backup":"keycloakdb-daily-20250613120200"}
{"level":"info","ts":"2025-06-13T12:25:44.754412291Z","msg":"Skipping retention policy enforcement, no retention policy specified","logging_pod":"keycloakdb-1"}
{"level":"info","ts":"2025-06-13T12:30:47.517659989Z","msg":"Skipping retention policy enforcement, no retention policy specified","logging_pod":"keycloakdb-1"}
{"level":"info","ts":"2025-06-13T12:35:50.152164082Z","msg":"Skipping retention policy enforcement, no retention policy specified","logging_pod":"keycloakdb-1"}
```

My expectations: that the backups would be streamed to a new bucket.

先从 issue 中的 ScheduledBackup 和 ObjectStore manifest 入手，然后将已应用的 ObjectStore 和 secret 值与日志中显示的 barman-cloud WAL 归档命令进行比较。确定如何刷新 ObjectStore 目标和凭据，并通过观察 WAL 归档使用新的 bucket 和凭据来验证完成情况。

由索引模型根据 Issue 内容生成。