Update Dockerfile

use --frozen

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Author: samppanja

Dockerfile

@@ -8,7 +8,7 @@ COPY . /app
 
 RUN apt-get update && apt-get install -y curl ca-certificates libmagic1 && curl -LsSf https://astral.sh/uv/install.sh | sh \
 && apt-get clean && rm -rf /var/lib/apt/lists/* \
-&& uv sync --no-dev
+&& uv sync --no-dev --frozen