roachtest: cluster_creation failed

roachtest.cluster_creation [failed](https://teamcity.cockroachdb.com/buildConfiguration/Cockroach_Nightlies_RoachtestNightlyAwsBazel/21385374?buildTab=log) with [artifacts](https://teamcity.cockroachdb.com/buildConfiguration/Cockroach_Nightlies_RoachtestNightlyAwsBazel/21385374?buildTab=artifacts#/kv0/enc=false/nodes=1/cpu=32) on release-26.1.6-rc @ [10b5d90a9c28f0c82282890142093c3308dca096](https://github.com/cockroachdb/cockroach/commits/10b5d90a9c28f0c82282890142093c3308dca096):

```
test kv0/enc=false/nodes=1/cpu=32 failed: (test_runner.go:1009).func4: in provider: aws: aws create failed due to capacity for machine type c6id.8xlarge in zone(s) [us-east-2c]: failed to run: aws ec2 run-instances --associate-public-ip-address --count 1 --instance-type c6id.8xlarge --image-id ami-0e83be366243f524a --key-name teamcity-runner-cfaMeDYL1BaBioMnHWaaNg7GckA= --region us-east-2 --security-group-ids sg-04d72b57e29d671f1 --subnet-id subnet-0e71591c1fe06645e --tag-specifications ResourceType=instance,Tags=[{Key=usage,Value=roachtest},{Key=roachtest-branch,Value=release-26-1-6-rc},{Key=spot,Value=true},{Key=roachprod,Value=true},{Key=cluster,Value=teamcity-21385374-1781330790-31-n2cpu32},{Key=lifetime,Value=12h0m0s},{Key=arch,Value=amd64},{Key=created,Value=2026-06-13T06:41:12Z},{Key=Name,Value=teamcity-21385374-1781330790-31-n2cpu32-0001},{Key=Cluster,Value=teamcity-21385374-1781330790-31-n2cpu32}] ResourceType=volume,Tags=[{Key=usage,Value=roachtest},{Key=roachtest-branch,Value=release-26-1-6-rc},{Key=spot,Value=true},{Key=roachprod,Value=true},{Key=cluster,Value=teamcity-21385374-1781330790-31-n2cpu32},{Key=lifetime,Value=12h0m0s},{Key=arch,Value=amd64},{Key=created,Value=2026-06-13T06:41:12Z},{Key=Name,Value=teamcity-21385374-1781330790-31-n2cpu32-0001},{Key=Cluster,Value=teamcity-21385374-1781330790-31-n2cpu32}] --user-data file:///tmp/aws-startup-script1235258745 --iam-instance-profile Name=roachprod-testing --block-device-mapping file:///tmp/aws-block-device-mapping753091394 --instance-market-options MarketType=spot,SpotOptions={SpotInstanceType=one-time,InstanceInterruptionBehavior=terminate} --output json: stderr:
An error occurred (InsufficientInstanceCapacity) when calling the RunInstances operation (reached max retries: 2): There is no Spot capacity available that matches your request.: exit status 254 [owner=test-eng]
```

Parameters:
- MetamorphicFilesystem=ext4
- MetamorphicVolumeType=gp3
- cloud=aws
- coverageBuild=false
- cpu=32
- diskCount=0
- 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)

Same failure on other branches

- #171623 roachtest: cluster_creation failed [O-roachtest O-robot T-testeng X-infra-flake branch-release-25.4.12-rc]
- #171620 roachtest: cluster_creation failed [O-roachtest O-robot T-testeng X-infra-flake branch-release-25.2.20-rc]
- #171526 roachtest: cluster_creation failed [O-roachtest O-robot T-testeng X-infra-flake branch-release-24.1.30-rc]
- #171104 roachtest: cluster_creation failed [O-roachtest O-robot T-testeng X-infra-flake branch-release-26.1]
- #170429 roachtest: cluster_creation failed [O-roachtest O-robot T-testeng X-infra-flake branch-release-26.1.5-rc]
- #170424 roachtest: cluster_creation failed [O-roachtest O-robot T-testeng X-infra-flake branch-release-25.4.11-rc]
- #170320 roachtest: cluster_creation failed [O-roachtest O-robot T-testeng X-infra-flake branch-release-25.2.19-rc]

/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-64747