don't generate all the key types

entrypoint.sh

@@ -1,7 +1,8 @@
 #!/bin/bash
 
 # This won't be executed if keys already exist (i.e. from a volume)
-ssh-keygen -A
+ssh-keygen -t ed25519
+ssh-keygen -t ecdsa
 
 # Copy authorized keys from ENV variable
 echo "$AUTHORIZED_KEYS" >$AUTHORIZED_KEYS_FILE