take 2 on slimming down example image

Dockerfile

@@ -1,18 +1,26 @@
-FROM python:3.9-alpine
+FROM python:3.11-alpine as build
 
-# TODO don't need gcc on the final image, but need it for poetry install
 RUN apk add build-base libffi-dev
+RUN pip install poetry
+ENV POETRY_NO_INTERACTION=1 \
+    POETRY_VIRTUALENVS_IN_PROJECT=1 \
+    POETRY_VIRTUALENVS_CREATE=1 \
+    PYTHONUNBUFFERED=1
 
 
-ENV PYTHONUNBUFFERED 1
-
 WORKDIR /app
+COPY . .
+
+WORKDIR /app/examples
+RUN poetry install --no-root --only main --no-cache
 
-RUN pip3 install poetry
+FROM python:3.11-alpine as runtime
 
-COPY . .
+ENV VIRTUAL_ENV=/app/examples/.venv \
+    PATH="/app/examples/.venv/bin:$PATH"
+
+COPY --from=build /app /app
 
 WORKDIR /app/examples
-RUN poetry install --no-root --only main
 
-CMD [ "poetry", "run", "uvicorn", "--host",  "0.0.0.0", "examples.app:app" ]
+CMD [ "uvicorn", "--host",  "0.0.0.0", "examples.app:app" ]