Keep old page on Gitlab Page

I have an account on https://gitlab.com/ and use gitlab page to host a static website.

At a tag of the repository I upload some page to myname.gitlab.io/project/ver1. And then, on a other commit to master I upload some page to myname.gitlab.io/project/testing.

The problem is when I upload to directory testing the ver1 will be delete or overwrite because when building testing I don’t build ver1

Is gitlab page or gitlab ci has any way for me to keep old version while continue writing another version?