Add VOLUME to Dockerfile

extras/Dockerfile

@@ -4,13 +4,13 @@ FROM python:3.9-slim
 # and we want the default answers to be used for all questions.
 ARG DEBIAN_FRONTEND=noninteractive
 
-# Don't generate byte code (.pyc-files). 
+# 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
 
-# Force the stdout and stderr streams to be unbuffered. 
-# Will allow log messages to be immediately dumped instead of being buffered. 
+# 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
 
@@ -22,7 +22,7 @@ RUN useradd --create-home botuser
 RUN chown -R botuser:botuser /home/botuser && chmod -R 755 /home/botuser
 USER botuser
 
-# Create directory for the sqlite database. 
+# Create directory for the sqlite database.
 # You need to share this directory with the computer running
 # the container to save the data.
 RUN mkdir -p /home/botuser/data
@@ -42,5 +42,7 @@ RUN poetry install --no-interaction --no-ansi --no-dev
 
 COPY discord_reminder_bot/main.py discord_reminder_bot/settings.py /home/botuser/discord_reminder_bot/
 
+VOLUME ["/home/botuser/data/"]
+
 # Run bot.
-CMD [ "poetry", "run", "bot" ]
+CMD [ "poetry", "run", "bot" ]