Exclude chart.lock in sylva-units oci artifact check

Francois Eleouetrequested to merge
build-artifact-ignore-chart-lock into main

What does this MR do and why?

Exclude chart.lock in sylva-units oci artifact check

As this file is not present in artifact, ignore its absence

It was causing pipelines to fail as in https://gitlab.com/sylva-projects/sylva-core/-/jobs/7817911130

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