Committed version 3 of the bot from the source code on my computer. Older versions of the bot were version controlled manually before I knew how to use Git.

posting/Dockerfile

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+FROM python:3.8.6-buster
+COPY . /usr/src/app
+WORKDIR /usr/src/app
+RUN pip install --upgrade pip
+RUN pip install -r requirements.txt
+RUN python -m nltk.downloader all
+CMD python3 -u ./script.py