Build docker image on ubuntu 1604

docker/Dockerfile

@@ -1,35 +1,41 @@
-FROM rust:1.38
+FROM ubuntu:16.04
 LABEL Description="Rust compile env for Linux + Windows (cross)"
 
 RUN apt update
-RUN apt install -y build-essential mingw-w64 gcc-aarch64-linux-gnu gcc-arm-linux-gnueabihf
+RUN apt install -y build-essential mingw-w64 gcc-aarch64-linux-gnu gcc-arm-linux-gnueabihf curl vim wget
+
+# Get Rust
+RUN curl https://sh.rustup.rs -sSf | bash -s -- -y
+ENV PATH="/root/.cargo/bin:${PATH}"
 
 RUN rustup target add x86_64-pc-windows-gnu
 RUN rustup target add aarch64-unknown-linux-gnu
 RUN rustup target add armv7-unknown-linux-gnueabihf
 
 # Append the linker to the cargo config for Windows cross compile
-RUN echo "[target.x86_64-pc-windows-gnu]" >> /usr/local/cargo/config && \
-    echo "linker = '/usr/bin/x86_64-w64-mingw32-gcc'" >> /usr/local/cargo/config
+RUN echo "[target.x86_64-pc-windows-gnu]" >> /root/.cargo/config && \
+    echo "linker = '/usr/bin/x86_64-w64-mingw32-gcc'" >> /root/.cargo/config
 
-RUN echo "[target.aarch64-unknown-linux-gnu]" >> /usr/local/cargo/config && \
-    echo "linker = '/usr/bin/aarch64-linux-gnu-gcc'" >> /usr/local/cargo/config
+RUN echo "[target.aarch64-unknown-linux-gnu]" >> /root/.cargo/config && \
+    echo "linker = '/usr/bin/aarch64-linux-gnu-gcc'" >> /root/.cargo/config
 
-RUN echo "[target.armv7-unknown-linux-gnueabihf]" >> /usr/local/cargo/config && \
-    echo "linker = '/usr/bin/arm-linux-gnueabihf-gcc'" >> /usr/local/cargo/config
+RUN echo "[target.armv7-unknown-linux-gnueabihf]" >> /root/.cargo/config && \
+    echo "linker = '/usr/bin/arm-linux-gnueabihf-gcc'" >> /root/.cargo/config
 
 ENV CC_x86_64_unknown_linux_musl="gcc" 
 ENV CC_aarch64_unknown_linux_gnu="aarch64-linux-gnu-gcc" 
 ENV CC_armv7_unknown_linux_gnueabhihf="arm-linux-gnueabihf-gcc"
 
 # This is a bug fix for the windows cross compiler for Rust.
-RUN cp /usr/x86_64-w64-mingw32/lib/crt2.o /usr/local/rustup/toolchains/1.38.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-pc-windows-gnu/lib/crt2.o
+RUN cp /usr/x86_64-w64-mingw32/lib/crt2.o /root/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-pc-windows-gnu/lib/crt2.o
 
 # For windows cross compilation, use a pre-build binary. Remember to set the
 # SODIUM_LIB_DIR for windows cross compilation
 RUN cd /opt && wget https://download.libsodium.org/libsodium/releases/libsodium-1.0.17-mingw.tar.gz && \
     tar xvf libsodium-1.0.17-mingw.tar.gz     
 
+RUN apt install -y git
+
 # Cargo fetch the dependencies so we don't download them over and over again
 RUN cd /tmp && git clone https://github.com/adityapk00/zecwallet-light-cli.git && \
     cd zecwallet-light-cli && \