Use GenAIComp base image to simplify Dockerfiles & reduce image sizes

AvatarChatbot/Dockerfile

@@ -1,48 +1,8 @@
 # Copyright (C) 2024 Intel Corporation
 # SPDX-License-Identifier: Apache-2.0
 
-# Stage 1: base setup used by other stages
-FROM python:3.11-slim AS base
-
-# get security updates
-RUN apt-get update && apt-get upgrade -y && \
-    apt-get clean && rm -rf /var/lib/apt/lists/*
-
-ENV HOME=/home/user
-
-RUN useradd -m -s /bin/bash user && \
-    mkdir -p $HOME && \
-    chown -R user $HOME
-
-WORKDIR $HOME
-
-
-# Stage 2: latest GenAIComps sources
-FROM base AS git
-
-RUN apt-get update && apt-get install -y --no-install-recommends git
-RUN git clone --depth 1 https://github.com/opea-project/GenAIComps.git
-
-
-# Stage 3: common layer shared by services using GenAIComps
-FROM base AS comps-base
-
-# copy just relevant parts
-COPY --from=git $HOME/GenAIComps/comps $HOME/GenAIComps/comps
-COPY --from=git $HOME/GenAIComps/*.* $HOME/GenAIComps/LICENSE $HOME/GenAIComps/
-
-WORKDIR $HOME/GenAIComps
-RUN pip install --no-cache-dir --upgrade pip setuptools && \
-    pip install --no-cache-dir -r $HOME/GenAIComps/requirements.txt
-WORKDIR $HOME
-
-ENV PYTHONPATH=$PYTHONPATH:$HOME/GenAIComps
-
-USER user
-
-
-# Stage 4: unique part
-FROM comps-base
+ARG BASE_TAG=latest
+FROM opea/comps-base:$BASE_TAG
 
 COPY ./avatarchatbot.py $HOME/avatarchatbot.py