Add Dockerfile

Dockerfile

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+FROM python:3.11-slim
+
+# Force the stdout and stderr streams to be unbuffered.
+# Will allow log messages to be immediately dumped instead of being buffered.
+# This is useful when the bot crashes before writing messages stuck in the buffer.
+ENV PYTHONUNBUFFERED 1
+
+# Don't generate byte code (.pyc-files).
+# These are only needed if we run the python-files several times.
+# Docker doesn't keep the data between runs so this adds nothing.
+ENV PYTHONDONTWRITEBYTECODE 1
+
+# Install Poetry
+RUN pip install poetry --no-cache-dir --disable-pip-version-check --no-color
+
+# Creata the botuser and create the directory where the code will be stored.
+RUN useradd --create-home botuser && \
+    install --verbose --directory --mode=0775 --owner=botuser --group=botuser /home/botuser/discord-rss-bot/ && \
+    install --verbose --directory --mode=0775 --owner=botuser --group=botuser /home/botuser/.local/share/discord_rss_bot/
+
+# Change to the bot user so we don't run as root.
+USER botuser
+
+# Copy files from our repository to the container.
+ADD --chown=botuser:botuser pyproject.toml poetry.lock README.md LICENSE /home/botuser/discord-rss-bot/
+
+# This is the directory where the code will be stored.
+WORKDIR /home/botuser/discord-rss-bot
+
+# Install the dependencies.
+RUN poetry install --no-interaction --no-ansi --only main
+
+ADD --chown=botuser:botuser discord_rss_bot /home/botuser/discord-rss-bot/discord_rss_bot/
+
+EXPOSE 5000
+VOLUME /home/botuser/.local/share/discord_rss_bot/
+
+CMD ["poetry", "run", "uvicorn", "discord_rss_bot.main:app", "--host", "0.0.0.0", "--port", "5000"]