Add build dockerfile

docker/Dockerfile

@@ -0,0 +1,14 @@
+FROM rust:1.34
+LABEL Description="Rust compile env for linux + windows (cross)"
+
+RUN apt update
+RUN apt install -y build-essential mingw-w64
+
+RUN rustup target add x86_64-pc-windows-gnu
+RUN rustup target add x86_64-unknown-linux-musl
+
+# 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
+
+ENV CC_x86_64_unknown_linux_musl="gcc"