[FEATURE] Add Docker instructions to documentation

[Serene-Arc]

As title says, add the commands to create a working docker instance to the documentation

[gageirwin]

Here is a docker template to run a bdfr script. docker_bdfr.zip If you want it to run on a schedule you would need to set up cron in the docker container to run the script.

Dockerfile (I use the ffmpeg yt-dlp recommends)

FROM debian:bullseye-slim as prep

RUN apt-get update
RUN apt-get install tar xz-utils wget --yes

# ffmpeg (https://github.com/yt-dlp/FFmpeg-Builds)
RUN wget https://github.com/yt-dlp/FFmpeg-Builds/releases/latest/download/ffmpeg-master-latest-linux64-gpl.tar.xz \
    && tar Jxf ffmpeg-master-latest-linux64-gpl.tar.xz

# Building Image
FROM python:3-slim

COPY --from=prep ffmpeg-master-latest-linux64-gpl/bin/ffmpeg /usr/local/bin
COPY --from=prep ffmpeg-master-latest-linux64-gpl/bin/ffprobe /usr/local/bin
COPY my_script.sh .

RUN pip install bdfr

VOLUME [ "/output" ]

CMD ["bash","my_script.sh"] 

build.bat

docker build -t my_bdfr .

start.bat (replace C:\Users\User\Downloads\bdfr with where you want the output to be on the host)

docker run^
    -it^
    --volume "C:\Users\User\Downloads\bdfr":/output^
    my_bdfr

my_script.sh (your bdfr command to be run every time the container is started)

python -m bdfr download /output --subreddit all