Initialize user name and email for test

For Github actions which start a fresh new container, those values are
not configured and we then fail to push any commit. We therefore need to
configure it beforehand.

Author: thescouser89

adjuster/src/test/resources/scripts/configure_upstream_and_downstream.sh

@@ -97,6 +97,8 @@ function check_binaries_are_installed() {
 
 function configure_git() {
   git config --global init.defaultBranch main
+  git config --global user.email "[email protected]"
+  git config --global user.name "Name Surname"
 }
 
 function configure_upstream() {