i386 dart test hangs

Dockerfile

FROM i386/debian:unstable-20220125-slim
ENV DEBIAN_FRONTEND noninteractive
RUN echo "deb-src http://deb.debian.org/debian unstable main" >> /etc/apt/sources.list
RUN apt-get update && \
    apt-get install -y \
       locales locales-all \
       sudo curl gnupg vim build-essential cmake pkg-config \
       locales wget git-buildpackage debhelper devscripts \
       apt-cacher-ng auto-apt-proxy bash-completion quilt
RUN apt-get build-dep -y dart
ENV LC_ALL en_US.UTF-8
ENV LANG en_US.UTF-8
ENV LANGUAGE en_US.UTF-8
RUN localedef -i en_US -c -f UTF-8 -A /usr/share/locale/locale.alias en_US.UTF-8
RUN locale-gen en_US.UTF-8
RUN cd /tmp && apt-get source dart
RUN cd /tmp/dart-* && quilt push -a || true
RUN cd /tmp/dart-* && mkdir build && cd build && cmake .. && make -j10 tests