Update start--pre.sh

Author: haobibo

docker_devbox/work/start--pre.sh

@@ -3,7 +3,7 @@ set -e
 
 # Generate a SSH id for git if it does not exist.
 # [ -e ~/.ssh/id_rsa.pub ] || ssh-keygen -t rsa -b 4096 -N "" -C `hostname -f` -f ~/.ssh/id_rsa
-[ -e ~/.ssh/id_rsa.pub ] || ssh-keygen -t ed25519 -N "" -C `hostname -f` -f ~/.ssh/id_ed25519
+[ -e ~/.ssh/id_ed25519.pub ] || ssh-keygen -t ed25519 -N "" -C `hostname -f` -f ~/.ssh/id_ed25519
 
 # Generate a self-signed certificate for jupyter if it does not exist (only when GEN_CERT or USE_SSL is set to yes).
 JUPYTER_PEM_FILE="/opt/conda/etc/jupyter/certificate.pem"