Add cross compilers

Author: Claudio Raimondi

Dockerfile

@@ -133,16 +133,22 @@ FROM base-builder AS base-builder-linux-amd64
 
 ARG target_host=x86_64-linux-gnu
 ARG target_host_rust=x86_64-unknown-linux-gnu
+ARG target_host_libc=amd64
+ARG target_host_gcc=x86-64-linux-gnu
 
 FROM base-builder AS base-builder-linux-arm64
 
 ARG target_host=aarch64-linux-gnu
 ARG target_host_rust=aarch64-unknown-linux-gnu
+ARG target_host_libc=arm64
+ARG target_host_gcc=aarch64-linux-gnu
 
 FROM base-builder AS base-builder-linux-arm
 
 ARG target_host=arm-linux-gnueabihf
 ARG target_host_rust=armv7-unknown-linux-gnueabihf
+ARG target_host_libc=armhf
+ARG target_host_gcc=arm-linux-gnueabihf
 
 FROM base-builder-${TARGETOS}-${TARGETARCH} AS builder
 
@@ -159,6 +165,11 @@ ARG QEMU_LD_PREFIX=/usr/${target_host}
 ARG TARGET=${target_host_rust}
 ARG PKG_CONFIG_PATH=${QEMU_LD_PREFIX}/lib/pkgconfig
 
+RUN apt-get install -qq -y --no-install-recommends \
+        libc6-${target_host_libc}-cross \
+        gcc-${target_host_gcc} \
+        g++-${target_host_gcc}
+
 WORKDIR /opt
 
 RUN ./install-rust.sh -y --target ${target_host_rust} --default-host ${target_host_rust} --profile minimal
@@ -205,7 +216,7 @@ RUN poetry lock && \
     poetry install --no-root --no-interaction --no-ansi
 
 RUN ./configure --prefix=/tmp/lightning_install --enable-static
-RUN poetry run make install
+RUN poetry run make -j install
 
 RUN for f in /tmp/lightning_install/bin/*; do \
   if file "$f" | grep -q ELF; then \