refactor demos (#398)

demos/samples_python/weather_forecast/Dockerfile

@@ -0,0 +1,41 @@
+# took inspiration from https://medium.com/@albertazzir/blazing-fast-python-docker-builds-with-poetry-a78a66f5aed0
+
+# The builder image, used to build the virtual environment
+FROM python:3.12 as builder
+
+RUN pip install poetry==1.8.3
+
+ENV POETRY_NO_INTERACTION=1 \
+    POETRY_VIRTUALENVS_IN_PROJECT=1 \
+    POETRY_VIRTUALENVS_CREATE=1 \
+    POETRY_CACHE_DIR=/tmp/poetry_cache
+
+WORKDIR /code
+
+COPY pyproject.toml poetry.lock ./
+RUN touch README.md
+
+RUN poetry install --no-root && rm -rf $POETRY_CACHE_DIR
+
+# The runtime image, used to just run the code provided its virtual environment
+FROM python:3.12-slim as runtime
+
+RUN apt-get update && apt-get install -y curl
+
+WORKDIR /code
+
+ENV VIRTUAL_ENV=/code/.venv \
+    PATH="/code/.venv/bin:$PATH"
+
+COPY --from=builder ${VIRTUAL_ENV} ${VIRTUAL_ENV}
+
+COPY main.py ./
+
+HEALTHCHECK \
+    --interval=5s \
+    --timeout=1s \
+    --start-period=1s \
+    --retries=3 \
+    CMD curl http://localhost:80/healthz
+
+CMD ["uvicorn", "main:app", "--host", "0.0.0.0", "--port", "80", "--log-level", "debug"]