Change nix sandbox from false to relaxed in builder dockerfile

Co-authored-by: copilot-swe-agent[bot] <[email protected]>
Co-authored-by: mrinalwadhwa <[email protected]>

Author: Copilot

tools/docker/dev/Dockerfile

@@ -4,7 +4,7 @@ WORKDIR /autonomy
 COPY tools/nix ./tools/nix
 
 RUN echo "experimental-features = nix-command flakes" >> /etc/nix/nix.conf \
-  && echo "sandbox = false" >> /etc/nix/nix.conf \
+  && echo "sandbox = relaxed" >> /etc/nix/nix.conf \
   && echo "filter-syscalls = false" >> /etc/nix/nix.conf \
   && nix-channel --update \
   && nix develop ./tools/nix --command echo "Nix environment built and cached" \