ironmq CI tests fail

In all recent PR builds. - eg https://github.com/apache/pekko-connectors/actions/runs/9486627304
```
Creating network "pekko-connectors_default" with the default driver
Creating volume "pekko-connectors_kudu-tserver-data" with default driver
Pulling ironauth (iron/auth:)...
latest: Pulling from iron/auth
[DEPRECATION NOTICE] Docker Image Format v1 and Docker Image manifest version 2, schema 1 support is disabled by default and will be removed in an upcoming release. Suggest the author of docker.io/iron/auth:latest to upgrade the image to the OCI Format or Docker Image manifest v2, schema 2. More information at https://docs.docker.com/go/deprecated-image-specs/
Error: Process completed with exit code 1.
```

Start with the linked GitHub Actions run and the CI configuration that invokes the IronMQ Docker setup; inspect why docker.io/iron/auth:latest cannot be pulled after the manifest deprecation. Reproduce the IronMQ CI job and make the PR build pass without the failing image error.

Written by the indexing model from the issue text.