build: add musl zig cross build image

.github/workflows/docker.yaml

@@ -49,6 +49,14 @@ jobs:
           push: true
           tags: ghcr.io/${{ github.repository }}/nodejs-rust:lts-debian-zig
 
+      - name: Build and push alpine with zig
+        uses: docker/build-push-action@v2
+        with:
+          file: alpine-zig.Dockerfile
+          platforms: linux/amd64
+          push: true
+          tags: ghcr.io/${{ github.repository }}/nodejs-rust:lts-alpine-zig
+
   build_image_arm:
     name: Build Node.js arm images
     strategy:

alpine-zig.Dockerfile

@@ -0,0 +1,11 @@
+FROM ghcr.io/napi-rs/napi-rs/nodejs-rust:lts-alpine
+
+ARG ZIG_VERSION=0.9.0
+
+RUN apk add xz && \
+  rustup target add x86_64-unknown-linux-gnu && \
+  wget https://ziglang.org/download/${ZIG_VERSION}/zig-linux-x86_64-${ZIG_VERSION}.tar.xz && \
+  tar -xvf zig-linux-x86_64-${ZIG_VERSION}.tar.xz && \
+  mv zig-linux-x86_64-${ZIG_VERSION} /usr/local/zig && \
+  ln -sf /usr/local/zig/zig /usr/local/bin/zig && \
+  rm zig-linux-x86_64-${ZIG_VERSION}.tar.xz