1FROM ubuntu:22.04 2RUN apt-get update && apt-get install -y --no-install-recommends \ 3 gcc libc6-dev ca-certificates \ 4 gcc-arm-linux-gnueabihf libc6-dev-armhf-cross qemu-user 5ENV CARGO_TARGET_ARM_UNKNOWN_LINUX_GNUEABIHF_LINKER=arm-linux-gnueabihf-gcc \ 6 CARGO_TARGET_ARM_UNKNOWN_LINUX_GNUEABIHF_RUNNER="qemu-arm -L /usr/arm-linux-gnueabihf" \ 7 PATH=$PATH:/rust/bin 8