Git mirror without cloning

What I want to do is to set up a bare mirror git repository without fetching the changes. It should be a fast operation compared to:

git clone --mirror $REPOURL

Here are the steps that I did to achieve the same results as a full clone:

# Create and update with the clone command
git clone --mirror https://github.com/matelakat/vimide vimide-with-clone
cd vimide-with-clone/
git fetch
cd ..

And let's create the equivalent:

git init --bare vimide-manual
cd vimide-manual
git remote add --mirror origin https://github.com/matelakat/vimide
git fetch
git pack-refs --all --prune
cd ..

You can see that the two directories are the same:

diff -r vimide-with-clone/ vimide-manual/ && echo "ALL the same"

ALL the same