GISAID build fails due to new "country" Lugansk missing from weights

[corneliusroemer]

In CI, test build fails:

[batch] [2025-12-11T12:26:59+00:00] ================================================================================
[batch] [2025-12-11T12:26:59+00:00] Sampling with weights defined by defaults/population_weights.tsv.
[batch] [2025-12-11T12:26:59+00:00] ERROR: The input metadata contains these values under the following columns that are not covered by 'defaults/population_weights.tsv':
[batch] [2025-12-11T12:26:59+00:00] - 'country': ['Lugansk']
[batch] [2025-12-11T12:26:59+00:00] To fix this, either:
[batch] [2025-12-11T12:26:59+00:00] (1) specify weights explicitly - add entries to 'defaults/population_weights.tsv' for the values above, or
[batch] [2025-12-11T12:26:59+00:00] (2) specify a default weight - add an entry to 'defaults/population_weights.tsv' with the value 'default' for all columns

https://github.com/nextstrain/ncov/actions/runs/20131845493/job/57775040965#step:5:8097