fix dubious ownership error in auto-cpufreq-installer (#597)

When trying to install auto-cpufreq in Fedora 39, I got the following error: "Detected Git repository, but failed because of dubious ownership"
Adding the line at the top of the install function according to https://sam.hooke.me/note/2023/08/poetry-fixing-dubious-ownership-error/ solved the error for me.

Author: amogus07

auto-cpufreq-installer

@@ -59,6 +59,7 @@ function setup_venv {
 
 # tool install
 function install {
+  git config --global --add safe.directory $(pwd)
   python -m pip install .
   mkdir -p /usr/local/share/auto-cpufreq/
   cp -r scripts/ /usr/local/share/auto-cpufreq/