from Hacker News

Since 2.34 you can use SSH keys to do commit signing, but my Debian 11 only comes with 2.30.

This little script is tested on Debian 11, modify as needed:

  #!/usr/bin/env bash

  which autoconf || sudo apt install -y autoconf
  which make || sudo apt install -y build-essential
  sudo apt install -y libcurl4-openssl-dev libz-dev libssl-dev libexpat-dev gettext asciidoc
  TMPD1=$(mktemp -d)
  cd $TMPD1
  wget -O git.tar.gz https://github.com/git/git/archive/refs/tags/v2.41.0.tar.gz
  gunzip git.tar.gz
  tar -xf git.tar
  rm git.tar
  cd git*
  pwd
  echo $TMPD1
  make configure
  ./configure --prefix=/usr
  make all doc
  sudo make install install-doc
  cd $HOME
  rm -rf $TMPD1
  echo Git 2.41.0 installed!
  git --version