Add option to use with zigbuild

Signed-off-by: Jacob Kiers <code@kiers.eu>

Dockerfile-zig

@@ -0,0 +1,25 @@
+FROM docker.io/library/rust:${RUST_VERSION}-slim
+LABEL maintainer 'Jacob Kiers <code@kie.rs>'
+ENV ZIG_VERSION=${ZIG_VERSION}
+
+# Install zig, binstall and zigbuild
+COPY zig/install-dependencies.sh /tmp/install-dependencies.sh
+RUN chmod +x /tmp/install-dependencies.sh && /tmp/install-dependencies.sh && rm /tmp/install-dependencies.sh
+
+# Install macOS SDKs
+RUN curl -L "https://github.com/phracker/MacOSX-SDKs/releases/download/11.3/MacOSX10.9.sdk.tar.xz" | tar -J -x -C /opt
+RUN curl -L "https://github.com/phracker/MacOSX-SDKs/releases/download/11.3/MacOSX11.3.sdk.tar.xz" | tar -J -x -C /opt
+ENV SDKROOT=/opt/MacOSX11.3.sdk
+
+# Install Rust targets
+RUN rustup target add \
+    x86_64-unknown-linux-gnu \
+    x86_64-unknown-linux-musl \
+    aarch64-unknown-linux-gnu \
+    aarch64-unknown-linux-musl \
+    arm-unknown-linux-gnueabihf \
+    arm-unknown-linux-musleabihf \
+    x86_64-apple-darwin \
+    aarch64-apple-darwin \
+    x86_64-pc-windows-gnu
+