chore: make some minor changes

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

@@ -4,6 +4,7 @@ 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"
 
+# Install uv and tools
 RUN curl -LsSf https://astral.sh/uv/install.sh | sh && \
     uv tool install hatch && \
     uv tool install ruff
@@ -12,6 +13,7 @@ WORKDIR /app
 
 COPY pyproject.toml .
 
+# Create and install dependencies in the virtual environment
 RUN uv venv venv && \
     . venv/bin/activate && \
     uv pip install .[dev]
@@ -27,10 +29,12 @@ ENV PATH="/app/venv/bin:/root/.local/bin:$PATH" \
 
 WORKDIR /app
 
+# Copy the virtual environment and application code
 COPY --from=builder /app/venv /app/venv
 COPY --from=builder /root/.local /root/.local
 COPY . .
 
+# Ensure the application builds and tests are executed correctly
 RUN hatch build && hatch test
 
 CMD ["python", "src/app.py"]