RVRNEXT-5 migration for main_currency_id

database/migrations/structure/20230428_1826_community_main_currency.sql

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+ALTER TABLE `communities`
+ADD `main_currency_id` int(10) unsigned DEFAULT NULL,
+ADD KEY `main_currency_id` (`main_currency_id`),
+ADD CONSTRAINT `communities_main_currency_id` FOREIGN KEY (`main_currency_id`) REFERENCES `currencies` (`id`);