Hello

Dockerfile

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+# We need gcc, build-essential and git to install our requirements but we 
+# don't need them when run the application so we can selectively copy artifacts
+# from this stage (compile-image) to second one (runtime-image), leaving 
+# behind everything we don't need in the final build. 
+FROM python:3.9-slim AS compile-image
+
+# We don't want apt-get to interact with us,
+# and we want the default answers to be used for all questions.
+# Is it also completely silent and unobtrusive.
+ARG DEBIAN_FRONTEND=noninteractive
+
+# Update packages and install needed packages to build our requirements.
+RUN apt-get update && \
+    apt-get install -y --no-install-recommends build-essential gcc git
+
+# Create new virtual environment in /opt/venv and change to it.
+ENV VIRTUAL_ENV=/opt/venv
+RUN python3 -m venv $VIRTUAL_ENV
+ENV PATH="$VIRTUAL_ENV/bin:$PATH"
+
+# Copy and install requirements.
+COPY requirements.txt .
+RUN pip install --disable-pip-version-check --no-cache-dir --requirement requirements.txt
+
+# Change to our second stage. This is the one that will run the application.
+FROM python:3.9-slim AS runtime-image
+RUN apt-get update && \
+    apt-get install -y --no-install-recommends ffmpeg
+# Copy Python dependencies from our build image.
+COPY --from=compile-image /opt/venv /opt/venv
+
+
+
+# Create user so we don't run as root.
+RUN useradd --create-home botuser
+
+# Create directories we need
+RUN mkdir -p /home/botuser/Uploads && mkdir -p /home/botuser/templates
+
+# Change ownership of directories
+RUN chown -R botuser:botuser /home/botuser && chmod -R 755 /home/botuser
+
+# Change user
+USER botuser
+
+# Change directory to where we will run the application.
+WORKDIR /home/botuser
+
+# Copy our Python application to our home directory.
+COPY main.py ./
+COPY Uploads/ ./Uploads
+COPY templates/ ./templates
+
+# Don't generate byte code (.pyc-files). 
+# These are only needed if we run the python-files several times.
+# Docker doesn't keep the data between runs so this adds nothing.
+ENV PYTHONDONTWRITEBYTECODE 1
+
+# Force the stdout and stderr streams to be unbuffered. 
+# Will allow log messages to be immediately dumped instead of being buffered. 
+# This is useful when the application crashes before writing messages stuck in the buffer.
+# Has a minor performance loss. We don't have many log messages so probably makes zero difference.
+ENV PYTHONUNBUFFERED 1
+
+# Use our virtual environment that we created in the other stage.
+ENV PATH="/opt/venv/bin:$PATH"
+
+# Make the website accessible outside localhost
+ENV FLASK_RUN_HOST=0.0.0.0
+
+# Expose the web port
+EXPOSE 5000
+
+# Run bot.
+CMD [ "gunicorn", "--workers=2", "--threads=4", "--log-file=-", "--bind=0.0.0.0:5000", "main:app"]