first steps towards support for arm64

docker/codex_multiarch.Dockerfile

@@ -0,0 +1,18 @@
+FROM ubuntu:lunar-20230415 AS builder
+RUN apt-get update && apt-get install -y git cmake curl make bash lcov build-essential nim
+RUN echo 'export NIMBLE_DIR="${HOME}/.nimble"' >> "${HOME}/.bash_env"
+RUN echo 'export PATH="${NIMBLE_DIR}/bin:${PATH}"' >> "${HOME}/.bash_env"
+
+WORKDIR /src
+COPY . .
+RUN make clean
+RUN make -j4 update
+RUN make -j4 NIM_PARAMS="-d:disableMarchNative"
+
+FROM ubuntu:lunar-20230415
+WORKDIR /root
+RUN apt-get update && apt-get install -y libgomp1 bash
+COPY --from=builder /src/build/codex ./
+COPY --from=builder /src/docker/startCodex.sh ./
+RUN chmod +x ./startCodex.sh
+CMD ["/bin/bash", "-l", "-c", "./startCodex.sh"]