Login shell after install (#5314)

Otherwise these files are not sourced:
  1. /etc/zprofile
  2. ~/.zprofile
  3. /etc/zlogin
  4. ~/.zlogin
  5. ~/.zlogout
  6. /etc/zlogout

tools/install.sh

@@ -108,7 +108,7 @@ main() {
   echo 'p.p.s. Get stickers and t-shirts at https://shop.planetargon.com.'
   echo ''
   printf "${NORMAL}"
-  env zsh
+  env zsh -l
 }
 
 main