Update stored procs/udf and update docker config

DataLayer/seed/functions/UDF_GetCountryIdByCode.sql

@@ -0,0 +1,19 @@
+USE Biergarten;
+GO
+
+CREATE OR ALTER FUNCTION dbo.UDF_GetCountryIdByCode
+(
+    @CountryCode NVARCHAR(2)
+)
+RETURNS UNIQUEIDENTIFIER
+AS
+BEGIN
+    DECLARE @CountryId UNIQUEIDENTIFIER;
+
+    SELECT @CountryId = CountryID
+    FROM dbo.Country
+    WHERE ISO3616_1 = @CountryCode;
+
+    RETURN @CountryId;
+END;
+GO