feat(database): add tax database creation to postgres.yaml

Adds the creation of the 'tax' database in the Postgres configuration to 
enhance data management capabilities for financial transactions. This 
change improves the database structure and prepares for future data 
requirements.

kind/postgres.yaml

@@ -28,6 +28,7 @@ data:
     	CREATE DATABASE salary WITH OWNER postgres ENCODING utf8;
     	CREATE DATABASE supplier WITH OWNER postgres ENCODING utf8;
     	CREATE DATABASE supplier_invoice WITH OWNER postgres ENCODING utf8;
+    	CREATE DATABASE tax WITH OWNER postgres ENCODING utf8;
     	CREATE DATABASE time WITH OWNER postgres ENCODING utf8;
     	CREATE DATABASE dancefinder WITH OWNER postgres ENCODING utf8;
     	CREATE DATABASE hifi WITH OWNER postgres ENCODING utf8;