Optimize runner Docker image building

dockerfile

@@ -1,23 +1,36 @@
 # Use official Python image
-FROM python:3.11-slim
+FROM python:3.11-slim as builder
 
-# Set working directory
-WORKDIR /app
-
-# Install dependencies
+# Install system dependencies for building
 RUN apt-get update && apt-get install -y \
     gcc \
     python3-dev \
     && rm -rf /var/lib/apt/lists/*
 
-# Install tini for better signal handling in container
-RUN apt-get update && apt-get install -y tini
+# Create virtual environment
+RUN python -m venv /opt/venv
+ENV PATH="/opt/venv/bin:$PATH"
 
 # Copy requirements first to leverage Docker cache
 COPY requirements.txt .
 
-# Install Python dependencies
-RUN pip install --no-cache-dir -r requirements.txt
+# Install Python dependencies with cache dir
+RUN --mount=type=cache,target=/root/.cache/pip \
+    pip install --no-cache-dir -r requirements.txt
+
+# Final stage
+FROM python:3.11-slim
+
+# Set working directory
+WORKDIR /app
+
+# Install tini for better signal handling in container
+RUN apt-get update && apt-get install -y tini && \
+    rm -rf /var/lib/apt/lists/*
+
+# Copy virtual environment from builder
+COPY --from=builder /opt/venv /opt/venv
+ENV PATH="/opt/venv/bin:$PATH"
 
 # Create a non-root user
 RUN groupadd -r bot && useradd -r -g bot bot
@@ -26,14 +39,9 @@ RUN groupadd -r bot && useradd -r -g bot bot
 COPY --chown=bot:bot . .
 
 # Create directories for persistent storage and modify permissions
-RUN chown -R bot:bot /app && \
-    chmod -R 777 /app
-RUN mkdir -p logs && \
-    chown -R bot:bot logs && \
-    chmod -R 777 logs && \
-    mkdir -p embed && \
-    chown -R bot:bot embed && \
-    chmod -R 777 embed
+RUN mkdir -p logs embed && \
+    chown -R bot:bot /app logs embed && \
+    chmod -R 777 /app logs embed
 
 # Switch to non root user
 USER bot