Complete move of remote Git repository

I encountered the following interesting task at my job.

We move all our git-repositories from our remote server to our brand-new instance of GitLab.  

Obviously, simple git clone and git push to a new remote is not exactly what we want. We have way more remote branches on remote and for the branches a have locally they are not all on the current stage. The solution would be to check put every branch and pull it. The same with tags, we have a lot.  The same for push. Simple git push pushes only one specific branch at a time. 

It comes to a big pile of boring operations giving that we have about 20 repos. 

What I've found is git clone --bare command and git push --mirror 

Let's take a look at the example

git clone --bare https://github.com/exampleuser/old-repository.git

git push --mirror https://github.com/exampleuser/new-repository.git

See official docs from GitHub

https://docs.github.com/en/repositories/creating-and-managing-repositories/duplicating-a-repository