Refine push alias to get confirmation if more than 4 commits pushed

[gberche-orange]

Expected behavior

As an operator,
In order to prevent pushing by mistake a featre branch with many commits (typically created from another release),
I need the git push alias to get confirmation when number of commits to be pushed exceed 5

#See https://stackoverflow.com/a/61395451/1484823
NB_COMMITS_TO_PUSH=$(git rev-list origin/main.. --count)
if [[ ${NB_COMMITS_TO_PUSH} -gt 5 ]]; then
   echo "Are you sure to push ${NB_COMMITS_TO_PUSH} commits to branch origin/main? Is you branch based on the right source branch ?"
....
fi

See also related git commands to list commits yet to be pushed https://stackoverflow.com/questions/2016901/how-to-list-unpushed-git-commits-local-but-not-on-origin/2016954#2016954

Observed behavior

alias push
alias push='git pull --rebase ; git fetch --prune ; git push'