case-sensitivity mismatch in geoipchecker.go

1. GeoIPCheckerFor stored country codes as-is (e.g., "CZ")
2. Check lowercased the lookup result before comparing (strings.ToLower(ipInfo.GetCountryCode()))

So "CZ" in config never matched "cz" from the gRPC response.

Author: lenny87

lib/thoth/geoipchecker.go

@@ -18,7 +18,7 @@ func (c *Client) GeoIPCheckerFor(countries []string) checker.Impl {
 	var sb strings.Builder
 	fmt.Fprintln(&sb, "GeoIPChecker")
 	for _, cc := range countries {
-		countryMap[cc] = struct{}{}
+		countryMap[strings.ToLower(cc)] = struct{}{}
 		fmt.Fprintln(&sb, cc)
 	}