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Having more images enables the bridge operators to directly pull an image instead of modifying the Dockerfile and consequently building that image. For example, the supported architectures can be x86_64, aarch64 and arm. In order to do so we can have multiple Dockerfile.arch where is used https://github.com/multiarch/qemu-user-static in order to build such image.

For example in the Dockerfile.arm file the content should be something like:

# Base docker image
FROM multiarch/qemu-user-static:x86_64-arm as qemu
FROM arm32v7/debian:buster-slim
COPY --from=qemu /usr/bin/qemu-arm-static /usr/bin

# Install remaining dependencies.
RUN apt-get update && apt-get install -y \
    tor                 \
    tor-geoipdb \
    obfs4proxy  \
    libcap2-bin \
    --no-install-recommends

# Allow obfs4proxy to bind to ports < 1024.
RUN setcap cap_net_bind_service=+ep /usr/bin/obfs4proxy
RUN setcap cap_net_bind_service=+ep /usr/bin/tor

# Our torrc is generated at run-time by the script start-tor.sh.
RUN rm /etc/tor/torrc
RUN chown debian-tor:debian-tor /etc/tor
RUN chown debian-tor:debian-tor /var/log/tor

COPY start-tor.sh /usr/local/bin
RUN chmod 0755 /usr/local/bin/start-tor.sh

COPY get-bridge-line /usr/local/bin
RUN chmod 0755 /usr/local/bin/get-bridge-line

USER debian-tor

CMD [ "/usr/local/bin/start-tor.sh" ]

Trac:
Username: thymbahutymba