defined build of container

Dockerfile

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+###########
+# BUILDER #
+###########
+
+# pull official base image
+FROM python:3.10-bookworm as BUILDER
+
+# install Ookla's speedtest
+RUN apt update && \
+    apt install -y speedtest-cli
+
+# set environment variables
+ENV PYTHONDONTWRITEBYTECODE 1
+ENV PYTHONUNBUFFERED 1
+
+# install dependencies
+WORKDIR /usr/src/app
+COPY requirements.txt .
+RUN pip install --upgrade pip && \
+    pip wheel --no-cache-dir --no-deps --wheel-dir /usr/src/app/wheels -r requirements.txt
+
+#########
+# FINAL #
+#########
+
+FROM python:3.10-bookworm
+
+# create home direcroty and app user
+RUN mkdir -p /home/app && \
+    addgroup --system app && \
+    adduser --system --group app
+
+# install packages from builder
+COPY --from=BUILDER /usr/src/app/wheels /wheels
+COPY --from=BUILDER /usr/src/app/requirements.txt requirements.txt
+RUN pip install --no-cache /wheels/*
+
+# copy in files
+WORKDIR /home/app
+COPY ./code .
+
+# change ownership to app user
+RUN chown -R app:app /home/app
+
+# change to the app user
+USER app
+
+# start execution
+ENTRYPOINT [ "python", "main.py" ]