Add Cachix Key to the Secret

[spatialthoughts]

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On what type of device(s) did you see this bug?

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On which operating system(s) are you seeing the problem?

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Other OS

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On which browser(s) are you seeing the problem?

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Other Browser

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Summary

The action Build and push to Cachix has been failing due to some auth error.

See log at https://github.com/qgis/QGIS-UG-India/actions/runs/22845888286/job/66262034644

[Xpirix]

Hi @timlinux , we should also create a CACHIX key for this repo.