Run gen-cert.sh script and generate certificates. Place the files inside ./cert directory and name them ftp.crt and ftp.key.
Change the ./conf/vsftpd.conf according to your needs. By default, the configuration is made to run on a docker bridge network.
If you want to run it as is. Please change the pasv_address=<your-host-ip> to match your host IP in order to enable the passive mode.
If you want to run the container in host network mode. Please comment out the pasv_address=<your-host-ip> setting.
The fix-conf-perm.sh script changes the permissions for the configuration file on host in order to make changes. These permissions are then properly configured inside the container.