Install git for ubuntu 22.04

Author: tobiasdiez

.github/workflows/ci.yml

@@ -46,6 +46,10 @@ jobs:
             # but we need the maxima help to be in place
             sed -i '/^NoExtract/d' /etc/pacman.conf
           fi
+          if [ "${{ matrix.container }}" = "ubuntu:22.04" ]; then
+            apt-get update
+            apt-get install -y git
+          fi
 
       - name: Checkout code
         # cannot use v4 yet because of https://github.com/actions/checkout/issues/1487