[LogsDB] [Subscription basic] [sysdig] Failing test daily: system test: default in sysdig.alerts

- Stack version: maximum of either the version used in PR builds or 8.17.0 (GA version for LogsDB index mode)
- LogsDB: enabled
- Subscription: basic
- Package: sysdig
- Failing test: system test: default
- DataStream: alerts
- Owners:
- @elastic/security-service-integrations
- @elastic/sit-crest-contractors

Error:
```
could not setup service: could not boot up service using Docker Compose: running Docker Compose up command failed: exit status 18: Head "https://docker.elastic.co/v2/observability/stream/manifests/v0.20.0": Get "https://docker-auth.elastic.co/auth?account=jenkins_ro&scope=repository%3Aobservability%2Fstream%3Apull&service=token-service": net/http: request canceled while waiting for connection (Client.Timeout exceeded while awaiting headers)
```

First build failed: https://buildkite.com/elastic/integrations/builds/49558

Start with the failed Buildkite run and the `system test: default` for the sysdig package’s `alerts` DataStream. Investigate the Docker Compose startup failure while fetching `observability/stream` v0.20.0 from the registry; done means the daily system test completes successfully for the stated LogsDB and basic-subscription configuration.

Written by the indexing model from the issue text.