Use pipx to install uv instead of pip3 --break-system-packages

Co-authored-by: samppanja <21281919+samppanja@users.noreply.github.com>

Author: Copilot

Dockerfile

@@ -6,8 +6,8 @@ WORKDIR /app
 ENV PATH="/root/.local/bin/:$PATH"
 COPY . /app
 
-RUN apt-get update && apt-get install -y python3-pip ca-certificates libmagic1 \
-    && pip3 install --no-cache-dir --break-system-packages "uv==0.6.3" \
+RUN apt-get update && apt-get install -y pipx ca-certificates libmagic1 \
+    && pipx install "uv==0.6.3" \
     && apt-get clean && rm -rf /var/lib/apt/lists/* \
     && uv sync --no-dev --frozen