chore: move the go code into a subfolder

apps/api/internal/config/hook/base64_to_bytes.go

@@ -0,0 +1,26 @@
+package hook
+
+import (
+	"encoding/base64"
+	"reflect"
+
+	"github.com/mitchellh/mapstructure"
+)
+
+func Base64ToBytesHookFunc() mapstructure.DecodeHookFuncType {
+	return func(
+		f reflect.Type,
+		t reflect.Type,
+		data interface{},
+	) (interface{}, error) {
+		if f.Kind() != reflect.String {
+			return data, nil
+		}
+
+		if t != reflect.TypeOf([]byte{}) {
+			return data, nil
+		}
+
+		return base64.StdEncoding.DecodeString(data.(string))
+	}
+}