roachtest: cluster_creation failed

roachtest.cluster_creation [failed](https://teamcity.cockroachdb.com/buildConfiguration/Cockroach_Nightlies_RoachtestNightlyAzureBazel/20651564?buildTab=log) with [artifacts](https://teamcity.cockroachdb.com/buildConfiguration/Cockroach_Nightlies_RoachtestNightlyAzureBazel/20651564?buildTab=artifacts#/kv0/enc=false/nodes=3/size=64kb/splt=100) on master @ [901677f2dee53449e53708ff0aa318d8ee235c02](https://github.com/cockroachdb/cockroach/commits/901677f2dee53449e53708ff0aa318d8ee235c02):

```
test kv0/enc=false/nodes=3/size=64kb/splt=100 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=8
- 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-55816

Start with the roachtest README, the failure at test_runner.go:990, and the linked TeamCity build and artifacts. Investigate the Azure provider authentication failure and the environment or login state used by the cluster_creation test. Done means the test can create its Azure cluster successfully with the expected credentials.

Written by the indexing model from the issue text.