By default container work with UTC time. It makes it difficult to work with cron scheduling.

I think it will may be fixed by add tzdata package into build image

    chmod +x /usr/bin/youtube-dl && \
    apk --no-cache add ca-certificates python ffmpeg
-    apk --no-cache add ca-certificates python ffmpeg
+    apk --no-cache add ca-certificates python ffmpeg tzdata

After that users can mount timezone file into container or use ENV TZ=.../... variables.
I'm not sure that's optimal way. What do you think?