roachtest: cluster_creation failed

roachtest.cluster_creation [failed](https://teamcity.cockroachdb.com/buildConfiguration/Cockroach_Nightlies_RoachtestNightlyAzureBazel/20645243?buildTab=log) with [artifacts](https://teamcity.cockroachdb.com/buildConfiguration/Cockroach_Nightlies_RoachtestNightlyAzureBazel/20645243?buildTab=artifacts#/tpcc/headroom/n4cpu16) on master @ [04f49359a573681a93d9724f37b6582b420eaf1b](https://github.com/cockroachdb/cockroach/commits/04f49359a573681a93d9724f37b6582b420eaf1b):

```
test tpcc/headroom/n4cpu16 failed: (test_runner.go:990).func4: in provider: azure: unable to authenticate; please use ``az login`` or double check environment variables [owner=test-eng]
```

Parameters:
- cloud=azure
- coverageBuild=false
- cpu=16
- runtimeAssertionsBuild=false
- ssd=0
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)

/cc @cockroachdb/test-eng

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

Jira issue: CRDB-55764

Start with the linked TeamCity log and artifacts, then read the roachtest README and the cluster_creation failure around test_runner.go:990. Determine why Azure authentication failed in the reported run; done means the Azure-backed cluster_creation test completes successfully without the authentication error.

Written by the indexing model from the issue text.