Fix all the bugs

Dockerfile

@@ -1,38 +1,64 @@
-FROM python:3.12-slim
+# Stage 1: Build the requirements.txt using Poetry.
+FROM python:3.12 AS builder
 
-# 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.
+# Set environment variables for Python.
+ENV PYTHONDONTWRITEBYTECODE 1
+ENV PYTHONUNBUFFERED 1
+ENV PATH="${PATH}:/root/.local/bin"
+
+# Install system dependencies.
+RUN apt-get update && \
+    apt-get install -y --no-install-recommends \
+    curl \
+    && rm -rf /var/lib/apt/lists/*
+
+# Install Poetry.
+RUN curl -sSL https://install.python-poetry.org | python3 -
+
+# Copy only the poetry.lock/pyproject.toml to leverage Docker cache.
+WORKDIR /app
+COPY pyproject.toml poetry.lock /app/
+
+# Install dependencies and create requirements.txt.
+RUN poetry self add poetry-plugin-export && poetry export --format=requirements.txt --output=requirements.txt --only=main --without-hashes
+
+# Stage 2: Install dependencies and run the application
+FROM python:3.12 AS runner
+
+# Set environment variables for Python.
+ENV PYTHONDONTWRITEBYTECODE 1
 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 && \
+# Create a non-root user.
+RUN useradd -ms /bin/bash 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/
 
+# Copy the generated requirements.txt from the builder stage.
+WORKDIR /home/botuser/discord-rss-bot
+COPY --from=builder /app/requirements.txt /home/botuser/discord-rss-bot/
+
+# Create a virtual environment and install dependencies.
+RUN python -m venv /home/botuser/.venv && \
+    . /home/botuser/.venv/bin/activate && \
+    pip install --no-cache-dir --upgrade pip && \
+    pip install --no-cache-dir --upgrade setuptools wheel && \
+    pip install --no-cache-dir --requirement requirements.txt
+
+# Copy the rest of the application code.
+COPY . /home/botuser/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/
-
+# The uvicorn server will listen on this port.
 EXPOSE 5000
+
+# Where our database file will be stored.
 VOLUME /home/botuser/.local/share/discord_rss_bot/
 
-CMD ["poetry", "run", "uvicorn", "discord_rss_bot.main:app", "--host", "0.0.0.0", "--port", "5000", "--proxy-headers", "--forwarded-allow-ips='*'"]
+# Print the folder structure and wait so we can inspect the container.
+# CMD ["tail", "-f", "/dev/null"]
+
+# Run the application.
+CMD ["/home/botuser/.venv/bin/python", "-m", "uvicorn", "discord_rss_bot.main:app", "--host=0.0.0.0", "--port=5000", "--proxy-headers", "--forwarded-allow-ips='*'", "--log-level", "debug"]