migrated to lightweight python-slim over ubuntu

dockerfile_build/Dockerfile

@@ -1,19 +1,12 @@
+FROM python:3.11-slim-bookworm
 
-FROM ubuntu:22.04
-# Install openbabel and python
 RUN apt-get update \
     && apt-get install --yes --quiet --no-install-recommends \
-    python3 \
-    python3-pip \
+    openbabel \
     && apt-get clean && rm -rf /var/lib/apt/lists/*
 
 WORKDIR /var/local
-
 COPY requirements.txt .
-
-# Install dependencies
-RUN /usr/bin/python3 -m pip install --no-cache-dir -r requirements.txt
-
+RUN pip install --no-cache-dir -r requirements.txt
 COPY src .
-
 CMD uvicorn app:app --host 0.0.0.0 --port ${PORT} --log-level warning