Доповнити календар робочих днів, що використовуються на ЦБД

Expected results
На початок року

holidays = ["2020-01-01", "2020-01-06", "2020-01-07", "2020-03-09", "2020-04-20", "2020-05-01", "2020-05-09", "2020-05-11", "2020-06-08", "2020-06-29", "2020-08-24", "2020-10-14", "2020-12-25", "2021-01-01", "2021-01-07", "2021-01-08", "2021-03-08", "2021-05-03", "2021-05-10", "2021-06-21", "2021-06-28", "2021-08-23", "2021-08-24", "2021-10-14", "2021-10-15", "2021-12-27"]

working = ["2020-01-11", "2021-01-16", "2021-08-28", "2021-10-23"]

Actual results
https://gitlab.prozorro.sale/prozorro-sale/prozorro-deployment/-/blob/master/values/date-config.yml

https://prozorrosale.slack.com/archives/GELCEQ1F0/p1626771331005600

@olga.kochubynska