cross 0.2.3

Zero setup cross compilation and cross testing
Documentation 
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FROM ubuntu:20.04
ARG DEBIAN_FRONTEND=noninteractive

COPY common.sh lib.sh /
RUN /common.sh

COPY cmake.sh /
RUN /cmake.sh

COPY xargo.sh /
RUN /xargo.sh

COPY android-ndk.sh /
RUN /android-ndk.sh x86 28
ENV PATH=$PATH:/android-ndk/bin

COPY android-system.sh /
RUN /android-system.sh x86

# We could supposedly directly run i686 binaries like we do for x86_64, but
# doing so generates an assertion failure:
#   ... assertion failed: signal(libc::SIGPIPE, libc::SIG_IGN) != libc::SIG_ERR
#   ... src/libstd/sys/unix/mod.rs
#   fatal runtime error: failed to initiate panic, error 5
#
# Running with qemu works as expected
COPY qemu.sh /
RUN /qemu.sh i386

RUN cp /android-ndk/sysroot/usr/lib/i686-linux-android/28/libz.so /system/lib/

COPY android-runner /

# Libz is distributed in the android ndk, but for some unknown reason it is not
# found in the build process of some crates, so we explicit set the DEP_Z_ROOT
ENV CARGO_TARGET_I686_LINUX_ANDROID_LINKER=i686-linux-android-gcc \
    CARGO_TARGET_I686_LINUX_ANDROID_RUNNER="/android-runner i686" \
    CC_i686_linux_android=i686-linux-android-gcc \
    CXX_i686_linux_android=i686-linux-android-g++ \
    BINDGEN_EXTRA_CLANG_ARGS_i686_linux_android="--sysroot=/android-ndk/sysroot" \
    DEP_Z_INCLUDE=/android-ndk/sysroot/usr/include/ \
    LIBZ_SYS_STATIC=1 \
    RUST_TEST_THREADS=1 \
    HOME=/tmp/ \
    TMPDIR=/tmp/ \
    ANDROID_DATA=/ \
    ANDROID_DNS_MODE=local \
    ANDROID_ROOT=/system