Multistage build

multistage-build/Dockerfile.multistage

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+FROM python:3.11-slim-bookworm AS install-dependencies
+
+# create and set main app directory
+WORKDIR /app
+
+# set virtual env path
+ENV \
+    PATH=/venv/bin:$PATH
+
+# install sys libs and create virtual env
+RUN \
+    apt update && \
+    apt install -y gcc libpq-dev python3-dev && \
+    python -m venv /venv
+
+# copy app files to /app directory
+COPY ./app/requirements.txt .
+
+# install dependencies && cleanup
+RUN \
+    pip install -r requirements.txt
+
+
+FROM python:3.11-slim-bookworm
+
+# set virtual env path
+ENV \
+    PATH=/venv/bin:$PATH
+
+# does nothing, for documentation only
+EXPOSE 3000
+
+# create and set main app directory
+WORKDIR /app
+
+COPY --from=install-dependencies /venv /venv
+
+# copy app files to /app directory
+COPY ./app .
+
+RUN ls -alF /
+RUN ls -alF /venv
+RUN ls -alF /venv/bin
+RUN ls -alF /app
+
+
+# start shell script when container starts
+ENTRYPOINT ["/app/run.sh"]
+
+# no additional parameters to run.sh script
+CMD []