Add git in installed packages and fix a shell condition

setup.sh

@@ -23,7 +23,7 @@ install_packages() {
   sed -i -e "s/$deb_apt_default_repo/$deb_apt_repo/g" /etc/apt/sources.list
   apt update
   apt upgrade -y
-  apt install -y vim tree tmux neofetch
+  apt install -y vim tree tmux neofetch git
 }
 
 add_users() {
@@ -60,7 +60,7 @@ set_sshd_conf() {
 }
 
 set_cpufreq() {
-  if [ $default_hostname = 'orangepizero' ]; then
+  if [[ $default_hostname = 'orangepizero' ]]; then
     echo "Setting CPU frequency to performance"
     sed -i -e "s/GOVERNOR=ondemand/GOVERNOR=performance/g" /etc/default/cpufrequtils
   fi