Change host key permission to 600 and avoid error

See atmoz@4e4726a#commitcomment-41292709

files/entrypoint

@@ -67,14 +67,14 @@ if [ ! -f "$userConfFinalPath" ]; then
     # Generate unique ssh keys for this container, if needed
     if [ ! -f /etc/ssh/ssh_host_ed25519_key ]; then
         ssh-keygen -t ed25519 -f /etc/ssh/ssh_host_ed25519_key -N ''
-    else
-        chmod 700 /etc/ssh/ssh_host_ed25519_key
     fi
     if [ ! -f /etc/ssh/ssh_host_rsa_key ]; then
         ssh-keygen -t rsa -b 4096 -f /etc/ssh/ssh_host_rsa_key -N ''
-    else
-        chmod 700 /etc/ssh/ssh_host_rsa_key
     fi
+
+    # Restrict access from other users
+    chmod 600 /etc/ssh/ssh_host_ed25519_key || true
+    chmod 600 /etc/ssh/ssh_host_rsa_key || true
 fi
 
 # Source custom scripts, if any