Update Dockerfile

Dockerfile

@@ -41,6 +41,7 @@ RUN /usr/bin/ssh-keygen -A && \
     yes y | ssh-keygen -t rsa -b 2048 -f /etc/ssh/ssh_host_rsa_key -N "" || { echo "Failed to generate RSA key"; exit 1; } &&\
     yes y | ssh-keygen -t ecdsa -b 256 -f /etc/ssh/ssh_host_ecdsa_key -N "" || { echo "Failed to generate ECDSA key"; exit 1; } &&\
     yes y | ssh-keygen -t ed25519 -f /etc/ssh/ssh_host_ed25519_key -N "" || { echo "Failed to generate ED25519 key"; exit 1; } && \
+    touch /etc/ssh/ssh_known_hosts &&\
     ssh-keygen -Hf /etc/ssh/ssh_known_hosts 
     #ssh-keyscan -p 2222 127.0.0.1 >> /etc/ssh/ssh_known_hosts