roachtest: backup/minio failed

roachtest.backup/minio [failed](https://teamcity.cockroachdb.com/buildConfiguration/Cockroach_Nightlies_Roachtests_RoachtestNightlyGcePrivateBazel/21513608?buildTab=log) with [artifacts](https://teamcity.cockroachdb.com/buildConfiguration/Cockroach_Nightlies_Roachtests_RoachtestNightlyGcePrivateBazel/21513608?buildTab=artifacts#/backup/minio) on release-25.2 @ [ed09bea8dd2a869fc586bc375cc730a05e115e05](https://github.com/cockroachdb/cockroach/commits/ed09bea8dd2a869fc586bc375cc730a05e115e05):

```
(cluster.go:2562).Run: full command output in run_062346.480666976_n4_sudo-docker-run-name.log: COMMAND_PROBLEM: exit status 125
test artifacts and logs in: /artifacts/backup/minio/cpu_arch=arm64/run_1
```

Parameters:
- arch=arm64
- cloud=gce
- coverageBuild=false
- cpu=4
- diskCount=0
- encrypted=false
- metamorphicBufferedSender=false
- metamorphicLeases=default
- runtimeAssertionsBuild=false
Help

See: [roachtest README](https://github.com/cockroachdb/cockroach/blob/master/pkg/cmd/roachtest/README.md)

See: [How To Investigate \(internal\)](https://cockroachlabs.atlassian.net/l/c/SSSBr8c7)

See: [Grafana](https://go.crdb.dev/roachtest-grafana/teamcity-21513608/backup-minio/1789194161934/1789194390804)

Same failure on other branches

- #175076 roachtest: backup/minio failed [C-test-failure O-roachtest O-robot T-field-eng branch-release-25.2.24-rc release-blocker]

/cc @cockroachlabs/field-engineering

[This test on roachdash](https://roachdash.crdb.dev/?filter=status:open%20t:.*backup/minio.*&sort=title+created&display=lastcommented+project) | [Improve this report!](https://github.com/cockroachdb/cockroach/tree/master/pkg/cmd/bazci/githubpost/issues)

Jira issue: CRDB-68221

Start with pkg/cmd/roachtest/README.md, then inspect the full command output in run_062346.480666976_n4_sudo-docker-run-name.log and the artifacts under /artifacts/backup/minio/cpu_arch=arm64/run_1. Compare the failure with #175076 and investigate roachtest.backup/minio at commit ed09bea8; done means the root cause is addressed and the test passes on arm64/GCE.

Written by the indexing model from the issue text.