Add workflows for Alpine binaries

.dockerignore

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+.*
+dist
+Dockerfile.*
+lib-es5
+node_modules

.github/workflows/build-alpine.yml

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+name: Build Node binaries for Alpine
+
+on:
+  workflow_dispatch:
+
+jobs:
+  alpine:
+    runs-on: ubuntu-20.04
+
+    strategy:
+      fail-fast: false
+      matrix:
+        target-node: [8, 10, 12, 14]
+        target-arch: [x64, arm64]
+        include:
+          - target-arch: x64
+            target-toolchain: x86_64
+          - target-arch: arm64
+            target-toolchain: aarch64
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v1
+
+      - name: Build
+        uses: docker/build-push-action@v2
+        with:
+          build-args: |
+            TARGET_TOOLCHAIN_ARCH=${{ matrix.target-toolchain }}
+            PKG_FETCH_OPTION_a=${{ matrix.target-arch }}
+            PKG_FETCH_OPTION_n=node${{ matrix.target-node }}
+          context: .
+          file: ./Dockerfile.alpine
+          platforms: linux/amd64
+          outputs: type=tar,dest=../out.tar
+
+      - name: Extract binaries from Docker image
+        run: |
+          tar xvf ../out.tar root/pkg-fetch/dist
+
+      - uses: actions/upload-artifact@v2
+        with:
+          name: node${{ matrix.target-node }}-alpine-${{ matrix.target-arch }}
+          path: root/pkg-fetch/dist/*

Dockerfile.alpine

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+ARG TARGET_TOOLCHAIN_ARCH
+
+FROM muslcc/x86_64:$TARGET_TOOLCHAIN_ARCH-linux-musl
+
+ARG PKG_FETCH_OPTION_a
+ARG PKG_FETCH_OPTION_n
+
+USER root:root
+
+WORKDIR /root/pkg-fetch/
+
+RUN apk add --no-cache build-base git linux-headers npm python2 python3 yarn
+
+# https://gitlab.alpinelinux.org/alpine/aports/-/issues/8626
+ENV CFLAGS=-U_FORTIFY_SOURCE
+ENV CFLAGS_host=-U_FORTIFY_SOURCE
+ENV CXXFLAGS=-U_FORTIFY_SOURCE
+ENV CXXFLAGS_host=-U_FORTIFY_SOURCE
+
+ENV CC=/bin/gcc
+ENV CXX=/bin/g++
+ENV AR=/bin/ar
+ENV NM=/bin/nm
+ENV READELF=/bin/readelf
+ENV STRIP=/bin/strip
+
+ENV CC_host=/usr/bin/gcc
+ENV CXX_host=/usr/bin/g++
+ENV AR_host=/usr/bin/ar
+ENV NM_host=/usr/bin/nm
+ENV READELF_host=/usr/bin/readelf
+
+COPY . ./
+
+RUN yarn install
+
+RUN yarn start --force-build --arch $PKG_FETCH_OPTION_a --node-range $PKG_FETCH_OPTION_n --output dist