refac/fix: dockerfile ollama cache issue

Dockerfile

@@ -108,29 +108,13 @@ RUN echo -n 00000000-0000-0000-0000-000000000000 > $HOME/.cache/chroma/telemetry
 # Make sure the user has access to the app and root directory
 RUN chown -R $UID:$GID /app $HOME
 
-RUN if [ "$USE_OLLAMA" = "true" ]; then \
-    apt-get update && \
-    # Install pandoc and netcat
-    apt-get install -y --no-install-recommends git build-essential pandoc netcat-openbsd curl && \
-    apt-get install -y --no-install-recommends gcc python3-dev && \
-    # for RAG OCR
-    apt-get install -y --no-install-recommends ffmpeg libsm6 libxext6 && \
-    # install helper tools
-    apt-get install -y --no-install-recommends curl jq && \
-    # install ollama
-    curl -fsSL https://ollama.com/install.sh | sh && \
-    # cleanup
-    rm -rf /var/lib/apt/lists/*; \
-    else \
-    apt-get update && \
-    # Install pandoc, netcat and gcc
-    apt-get install -y --no-install-recommends git build-essential pandoc gcc netcat-openbsd curl jq && \
-    apt-get install -y --no-install-recommends gcc python3-dev && \
-    # for RAG OCR
-    apt-get install -y --no-install-recommends ffmpeg libsm6 libxext6 && \
-    # cleanup
-    rm -rf /var/lib/apt/lists/*; \
-    fi
+# Install common system dependencies
+RUN apt-get update && \
+    apt-get install -y --no-install-recommends \
+    git build-essential pandoc gcc netcat-openbsd curl jq \
+    python3-dev \
+    ffmpeg libsm6 libxext6 \
+    && rm -rf /var/lib/apt/lists/*
 
 # install python dependencies
 COPY --chown=$UID:$GID ./backend/requirements.txt ./requirements.txt
@@ -152,7 +136,13 @@ RUN pip3 install --no-cache-dir uv && \
     fi; \
     chown -R $UID:$GID /app/backend/data/
 
-
+# Install Ollama if requested
+RUN if [ "$USE_OLLAMA" = "true" ]; then \
+    date +%s > /tmp/ollama_build_hash && \
+    echo "Cache broken at timestamp: `cat /tmp/ollama_build_hash`" && \
+    curl -fsSL https://ollama.com/install.sh | sh && \
+    rm -rf /var/lib/apt/lists/*; \
+    fi
 
 # copy embedding weight from build
 # RUN mkdir -p /root/.cache/chroma/onnx_models/all-MiniLM-L6-v2