Add unique instance label to helm chart

[stefannica]

Describe changes

It is currently not possible to properly configure Kubernetes affinity rules for ZenML Helm deployments for the following reason: there is no way to uniquely label all the pods belonging to the same ZenML Helm deployment.

Currently, all pods belonging to the same deployment are labeled with:

app.kubernetes.io/instance: {{ .Release.Name }}

where .Release.Name is the name used for the Helm release and is usually not unique across a Kubernetes cluster (e.g. usually just set to zenml). When deploying multiple ZenML servers in the same cluster, this poses a problem, because multiple ZenML pods may have the same labels (albeit across different namespaces).

This PR introduces a new option, zenml.instanceLabel that when set will be used as a app.kubernetes.io/instance label value instead of .Release.Name.

Pre-requisites

Please ensure you have done the following:

• I have read the CONTRIBUTING.md document.
• I have added tests to cover my changes.
• I have based my new branch on develop and the open PR is targeting develop. If your branch wasn't based on develop read Contribution guide on rebasing branch to develop.
• IMPORTANT: I made sure that my changes are reflected properly in the following resources:
  • ZenML Docs
  • Dashboard: Needs to be communicated to the frontend team.
  • Templates: Might need adjustments (that are not reflected in the template tests) in case of non-breaking changes and deprecations.
  • Projects: Depending on the version dependencies, different projects might get affected.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Other (add details above)

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[github-actions]

Documentation Link Check Results

❌ Absolute links check failed
There are broken absolute links in the documentation. See workflow logs for details
❌ Relative links check failed
There are broken relative links in the documentation. See workflow logs for details
_{Last checked: 2025-05-05 18:33:22 UTC}