I'm not sure if is possible to run the Docker addon at S805 due the kernel version.
See release notes at
LibreELEC (Jarvis) v7.0 BETA1 – LibreELEC
Have you installed docker from any other source?
No, I have not had success with Docker. You can tell me which version of transmission I install the libreelec to the S805? What website do I find?