feat: update python Dockerfile

template/py/{{cookiecutter.project_slug}}/Dockerfile

@@ -1,7 +1,9 @@
-FROM python:{{cookiecutter.python_version}}-bullseye AS venv
+# Base image for building the virtual environment
+FROM python:{{cookiecutter.python_version}}-bullseye AS builder
+
+ENV PATH="/root/.cargo/bin:$PATH" \
+    PIP_INDEX_URL="https://mirrors.cernet.edu.cn/pypi/web/simple"
 
-ENV PATH="/root/.cargo/bin/:$PATH"
-ENV PIP_INDEX_URL="https://mirrors.cernet.edu.cn/pypi/web/simple"
 RUN curl -LsSf https://astral.sh/uv/install.sh | sh && \
     uv tool install hatch && \
     uv tool install ruff
@@ -14,25 +16,21 @@ RUN uv venv venv && \
     . venv/bin/activate && \
     uv pip install .[dev]
 
-
+# Final image for running the application
 FROM python:{{cookiecutter.python_version}}-slim-bullseye
 
 LABEL author="{{cookiecutter.full_name}}"
 
-COPY --from=venv /app/venv /app/venv
-COPY --from=venv /root/.local/bin/hatch /root/.local/bin/hatch
-COPY --from=venv /root/.local/bin/ruff /root/.local/bin/ruff
-ENV PATH="/app/venv/bin:$PATH"
-ENV PATH="/root/.local/bin/:$PATH"
-ENV PYTHONDONTWRITEBYTECODE=1
-ENV PYTHONUNBUFFERED=1
+ENV PATH="/app/venv/bin:/root/.local/bin:$PATH" \
+    PYTHONDONTWRITEBYTECODE=1 \
+    PYTHONUNBUFFERED=1
 
 WORKDIR /app
 
-# if something you want ignore it, add it to .dockerignore
+COPY --from=builder /app/venv /app/venv
+COPY --from=builder /root/.local /root/.local
 COPY . .
 
 RUN hatch build && hatch test
 
-# CMD . .venv/bin/activate && python src/app.py
-CMD python src/app.py
+CMD ["python", "src/app.py"]