Add rust cross-compile

src/scripts/docker/Dockerfile

@@ -43,13 +43,20 @@ RUN cd /opt && \
     make -j$(nproc) MXE_TARGETS=x86_64-w64-mingw32.static qtbase qtwebsockets 
 
 # Add rust
+RUN apt install -y gcc-aarch64-linux-gnu
+
 RUN curl https://sh.rustup.rs -sSf | sh -s -- --default-toolchain 1.32.0  -y 
 RUN echo 'source $HOME/.cargo/env' >> $HOME/.bashrc
 RUN ~/.cargo/bin/rustup target add x86_64-pc-windows-gnu
+RUN ~/.cargo/bin/rustup target add aarch64-unknown-linux-gnu
 
 # Append the linker to the cargo config for Windows cross compile
 RUN echo "[target.x86_64-pc-windows-gnu]" >> ~/.cargo/config && \
     echo "linker = 'x86_64-w64-mingw32.static-gcc'" >> ~/.cargo/config
 
+RUN echo "[target.aarch64-unknown-linux-gnu]" >> ~/.cargo/config && \
+    echo "linker = '/usr/bin/aarch64-linux-gnu-gcc'" >> ~/.cargo/config
+
 ENV CC_x86_64_pc_windows_gnu="x86_64-w64-mingw32.static-gcc"
+ENV CC_aarch64_unknown_linux_gnu="aarch64-linux-gnu-gcc"
 ENV PATH="/opt/mxe/usr/bin:${PATH}"