Error when specifying user public key

[pragdev]

Hello, I'm not able to get the logging with ssh key working. This is the docker config

version: "2.1"

services:
  # https://hub.docker.com/r/atmoz/sftp/
  # connecting with: sftp -P 3333 user@localhost
  sftp:
    image: atmoz/sftp
    container_name: recon_sftp
    volumes:
      - ./src/main/resources/rsa_key.pub:/home/user-1/.ssh/keys/rsa_key.pub:ro
 
    ports:
      - "3333:22"
    command: "user-1::::test"

and this is the output:

recon_sftp  | [/usr/local/bin/create-sftp-user] Parsing user data: "user-1::::x"
recon_sftp  | cat: /home/user-1/.ssh/keys/rsa_key.pub: Is a directory
recon_sftp  | /usr/local/bin/create-sftp-user: Error on line 90: cat "$publickey" >> "$userKeysAllowedFileTmp"
recon_sftp  | /entrypoint: Error on line 60: create-sftp-user "$user"
recon_sftp exited with code 1

[pragdev]

Turned out, docker compose is creating a directory if you are using a path leading to a non existent file