Remove installation of several packages (#24)

Those packages are already installed as part of the actions-runner dockerfile,
so there's no need to install them once again.

Co-authored-by: Shishir Joshi <shishir@Shishirs-MacBook-Pro.local>
Co-authored-by: Oleksii Kliukin <oleksii@timescale.com>

setup-git-ssh/action.yaml

@@ -10,7 +10,6 @@ runs:
   steps:
     - name: Add ssh key
       run: |
-        sudo apt-get install git openssh-client gcc g++ -y 
         mkdir -p /home/runner/.ssh
         cp ${{ inputs.ssh-key }} /home/runner/.ssh/id_rsa
         sudo chmod 0600 /home/runner/.ssh/id_rsa