optimize image size

Dockerfile

@@ -1,10 +1,26 @@
 # syntax=docker/dockerfile:1
-FROM python:3.10-slim-buster
+FROM python:3.10.5-slim-bullseye as builder
+
 WORKDIR /app
-COPY makefile bot.py pyproject.toml ./
+COPY  pyproject.toml ./
+
+RUN python -m venv --copies venv
+ENV PATH="/app/venv/bin:$PATH"
+
+RUN pip install "poetry==1.1.13" --no-cache-dir && \
+    poetry config virtualenvs.create false && \
+    poetry install --no-dev --no-root --no-interaction --no-ansi && \
+    pip uninstall --yes poetry && \
+    pip cache purge && \
+    rm -rf ~/.cache/pypoetry/{cache,artifacts}
+
+FROM python:3.10.5-slim-bullseye as prod
+
+COPY --from=builder /app/venv app/venv
+ENV PATH="/app/venv/bin:$PATH"
+
+WORKDIR /app
+COPY bot.py ./
 COPY hnread ./hnread
-RUN pip install "poetry==1.1.13" --no-cache-dir \
-    && poetry config virtualenvs.create false \
-    && poetry install --no-dev --no-root --no-interaction --no-ansi \
-    && rm -rf ~/.cache/pypoetry/{cache,artifacts}
+
 CMD ["python", "bot.py"]