chore: use cache for pip

Dockerfile

@@ -4,17 +4,15 @@ FROM python:3.13-slim AS builder
 # Set working directory
 WORKDIR /app
 
-# # Install system dependencies
+# Create and set pip cache directory
-# RUN apt-get update && apt-get install -y \
+ENV PIP_CACHE_DIR=/root/.cache/pip
-#     build-essential \
-#     curl \
-#     && rm -rf /var/lib/apt/lists/*
 
 # Copy requirements file
 COPY requirements.txt .
 
-# Install Python dependencies
+# Install Python dependencies with bind-mounted cache
-RUN pip install --no-cache-dir --no-deps \
+RUN --mount=type=cache,id=pip,target=/root/.cache/pip \
+    pip install --no-deps \
     --disable-pip-version-check \
     --target=/app/site-packages \
     -r requirements.txt