add Helm chart

[tomkralidis]

As discussed at the 2025-12-05 online meeting, add Helm chart based on ESA/EOEPCA deployment of pygeoapi.

[github-actions]

This Issue has been inactive for 90 days. As per RFC4, in order to manage maintenance burden, it will be automatically closed in 7 days.

[webb-ben]

From brief google:

https://github.com/eoxhub-workspaces/pygeoapi-kubernetes-papermill

https://codebase.helmholtz.cloud/ufz-sdi/spatialio/-/tree/0.8.1-helm13/helm/charts/pygeoapi

https://github.com/spectriclabs/k8s-pygeoapi

but i know @kalxas might have something else?

[tomkralidis]

Pending geopython/pygeoapi-examples#29 (comment)