Start Zuul testing with multiple nodes

[cityofships]

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[gemini-code-assist]

Summary of Changes

Hello @cityofships, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request expands the continuous integration testing for Cephadm by introducing multi-node configurations for Ubuntu Jammy environments. This change enables more comprehensive testing of Ceph deployments, moving beyond single-node setups to better simulate real-world distributed cluster scenarios.

Highlights

• Zuul Job Configuration Update: Modified existing Zuul jobs (cephadm-jammy-singlenode-docker-reef and cephadm-jammy-singlenode-podman-reef) to use a new multi-node setup, renaming them to cephadm-jammy-multinode-docker-reef and cephadm-jammy-multinode-podman-reef respectively.
• New Multi-Node Definition: Introduced a new cephadm-jammy-multinode nodeset in Zuul, defining a three-node cluster (ceph-1, ceph-2, ceph-3) with Ubuntu Jammy labels, and assigning them to ceph, mons, mgrs, and osds groups.

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[gemini-code-assist]

Code Review

This pull request updates the Zuul configuration to run tests on a multi-node setup instead of a single node. The changes in zuul.d/jobs.yaml correctly rename the jobs and update them to use the new cephadm-jammy-multinode nodeset. The new nodeset defined in zuul.d/nodesets.yaml correctly sets up a 3-node environment. However, a critical file, zuul.d/project.yaml, has not been updated to use the new job names (cephadm-jammy-multinode-docker-reef and cephadm-jammy-multinode-podman-reef). Without this change, the new multi-node tests will not be triggered in check and gate pipelines. Please update zuul.d/project.yaml accordingly. I've also added a suggestion to improve the maintainability of the new nodeset definition.