use unbuffered output for docker
MODIFY
Dockerfile
Dockerfile
FROM python:3.9-alpine3.13 AS base
WORKDIR /app
-ENTRYPOINT ["python", "-m", "plex_trakt_sync"]
+ENTRYPOINT ["python", "-u", "-m", "plex_trakt_sync"]
# Install app depedencies
RUN pip install --no-cache-dir pipenv

use unbuffered output for docker