Fix Python/pip installation in CUDA image

Dockerfile

@@ -6,15 +6,23 @@ WORKDIR /app
 ENV OMP_NUM_THREADS=4
 ENV MKL_NUM_THREADS=4
 ENV DEBIAN_FRONTEND=noninteractive
+ENV PATH="/usr/local/bin:$PATH"
 
-# Install Python and dependencies
+# Install Python 3.11 and pip properly
 RUN apt-get update && apt-get install -y \
+    software-properties-common \
+    && add-apt-repository -y ppa:deadsnakes/ppa \
+    && apt-get update \
+    && apt-get install -y \
     python3.11 \
-    python3-pip \
     python3.11-venv \
+    python3.11-distutils \
+    curl \
     git \
     && rm -rf /var/lib/apt/lists/* \
-    && ln -sf /usr/bin/python3.11 /usr/bin/python
+    && ln -sf /usr/bin/python3.11 /usr/bin/python \
+    && ln -sf /usr/bin/python3.11 /usr/bin/python3 \
+    && curl -sS https://bootstrap.pypa.io/get-pip.py | python3.11
 
 # Copy requirements and install
 COPY requirements.txt .