feat: Build for both x86_64 and aarch64 platforms.

Dockerfile

@@ -8,11 +8,12 @@ ARG ZEPHYR_VERSION
 ENV ZEPHYR_VERSION=${ZEPHYR_VERSION}
 RUN \
   apt-get -y update \
+  && if [ "$(uname -m)" = "x86_64" ]; then gcc_multilib="gcc-multilib"; else gcc_multilib=""; fi \
   && apt-get -y install --no-install-recommends \
   ccache \
   file \
   gcc \
-  gcc-multilib \
+  "${gcc_multilib}" \
   git \
   gperf \
   make \
@@ -48,7 +49,6 @@ RUN \
   && apt-get -y update \
   && apt-get -y install --no-install-recommends \
   clang-format \
-  g++-multilib \
   gdb \
   gpg \
   gpg-agent \
@@ -86,16 +86,16 @@ FROM common AS build
 
 ARG ARCHITECTURE
 ARG ZEPHYR_SDK_VERSION
-ARG ZEPHYR_SDK_SETUP_FILENAME=zephyr-toolchain-${ARCHITECTURE}-${ZEPHYR_SDK_VERSION}-linux-x86_64-setup.run
 ARG ZEPHYR_SDK_INSTALL_DIR=/opt/zephyr-sdk-${ZEPHYR_SDK_VERSION}
 RUN \
-  apt-get -y update \
+  export sdk_file_name="zephyr-toolchain-${ARCHITECTURE}-${ZEPHYR_SDK_VERSION}-linux-$(uname -m)-setup.run" \
+  && apt-get -y update \
   && apt-get -y install --no-install-recommends \
   wget \
   xz-utils \
-  && wget -q "https://github.com/zephyrproject-rtos/sdk-ng/releases/download/v${ZEPHYR_SDK_VERSION}/${ZEPHYR_SDK_SETUP_FILENAME}" \
-  && sh ${ZEPHYR_SDK_SETUP_FILENAME} --quiet -- -d ${ZEPHYR_SDK_INSTALL_DIR} \
-  && rm ${ZEPHYR_SDK_SETUP_FILENAME} \
+  && wget -q "https://github.com/zephyrproject-rtos/sdk-ng/releases/download/v${ZEPHYR_SDK_VERSION}/${sdk_file_name}" \
+  && sh ${sdk_file_name} --quiet -- -d ${ZEPHYR_SDK_INSTALL_DIR} \
+  && rm ${sdk_file_name} \
   && apt-get remove -y --purge \
   wget \
   xz-utils \