roachtest: cluster_creation failed

**Note:** This build has runtime assertions enabled. If the same failure was hit in a run without assertions enabled, there should be a similar failure without this message. If there isn't one, then this failure is likely due to an assertion violation or (assertion) timeout.

roachtest.cluster_creation [failed](https://teamcity.cockroachdb.com/buildConfiguration/Cockroach_Nightlies_RoachtestNightlyAzureBazel/20652610?buildTab=log) with [artifacts](https://teamcity.cockroachdb.com/buildConfiguration/Cockroach_Nightlies_RoachtestNightlyAzureBazel/20652610?buildTab=artifacts#/process-lock) on master @ [cdcf76d0af53d78418ed10585fca7987c1c0aedc](https://github.com/cockroachdb/cockroach/commits/cdcf76d0af53d78418ed10585fca7987c1c0aedc):

```
test process-lock 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=4
- runtimeAssertionsBuild=true
- 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-55857

Start with pkg/cmd/roachtest/README.md and the test_runner.go:990 failure path for the process-lock test. Inspect the cluster_creation run with cloud=azure and its artifacts to determine whether the failure is specific to the test environment or Azure authentication. Done means the cause is confirmed and the roachtest no longer reports this authentication failure, or the environment requirement is documented.

Written by the indexing model from the issue text.