try to fix exit

Dockerfile

@@ -8,7 +8,7 @@ apt-get update && apt-get upgrade
 chmod +x /bin/bubble
 apt-get install -y curl jq neovim htop fish tmux sudo git
 useradd -m -s /usr/bin/fish user
-echo "user ALL=(ALL) NOPASSWD:ALL" > /etc/sudoers.d/user.conf
+echo "user ALL=(ALL) NOPASSWD:ALL" >> /etc/sudoers
 sudo -u user mkdir -p /home/user/.config/fish/
 EOF
 COPY ./init.fish /init.fish

user.fish

@@ -7,7 +7,7 @@ if test ! -e /bin/docker
 end
 
 function exit
-    tmux detach && exit
+    tmux detach
 end
 
 function install-docker