feat: dont call chsh in containers

run_onchange_before_11_zsh.sh.tmpl

@@ -7,8 +7,12 @@ if ! type zsh > /dev/null; then
 else
     # Make ZSH the default shell environment
     if [ $(cat /etc/passwd | grep $USER | awk -F ':' '{print substr($7, length($7)-3)}') != "/zsh" ]; then
+{{- if .ephemeral }}
+        echo "Ephemeral machine: leaving default shell as-is."
+{{- else }}
         echo "Changing shell to zsh."
         chsh -s $(which zsh) || echo "chsh failed, leaving default shell as-is." >&2
+{{- end }}
     else
         echo "Shell is already zsh."
     fi