docker/whalesay uses deprecated image format and does not support ARM

[joebowbeer]

Describe the bug

docker/whalesay:latest was published 9 years ago and has a serious issue:

docker/whalesay#6

Failed to pull image "docker/whalesay": [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.

This has been reported in argo-workflows:

argoproj/argo-workflows#13388
argoproj/argo-workflows#11858

and fixed by replacing whalesay with busybox:

argoproj/argo-workflows#13429

The argo-events repo also needs this fix. 👈

To Reproduce

1. Follow instructions in argo-events tutorials

Expected behavior
Examples work.

Environment (please complete the following information):

• Kubernetes: 1.30
• Argo: v3.5.11
• Argo Events: v1.9.2

---

Message from the maintainers:

If you wish to see this enhancement implemented please add a 👍 reaction to this issue! We often sort issues this way to know what to prioritize.

[github-actions]

This issue has been automatically marked as stale because it has not had
any activity in the last 60 days. It will be closed if no further activity
occurs. Thank you for your contributions.

[joebowbeer]

Not stale.