Add docker image

.github/workflows/docker.yml

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+name: Build Docker Images
+on:
+  push:
+    tags:
+      - v*
+  workflow_dispatch:
+    inputs:
+      tag:
+        description: "The tag version you want to build"
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+      - name: Setup Docker Buildx
+        uses: docker/setup-buildx-action@v1
+      - name: Login to GitHub Container Registry
+        uses: docker/login-action@v1
+        with:
+          registry: ghcr.io
+          username: ${{ github.repository_owner }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+      - name: Docker metadata
+        id: metadata
+        uses: docker/metadata-action@v3
+        with:
+          images: ghcr.io/sagernet/sing-box
+      - name: Get tag to build
+        id: tag
+        run: |
+          if [[ -z "${{ github.event.inputs.tag }}" ]]; then
+            echo ::set-output name=tag::ghcr.io/sagernet/sing-box:${{ github.ref_name }}
+          else
+            echo ::set-output name=tag::ghcr.io/sagernet/sing-box:${{ github.event.inputs.tag }}
+          fi
+      - name: Build and release Docker images
+        uses: docker/build-push-action@v2
+        with:
+          platforms: linux/386,linux/amd64
+          target: dist
+          tags: ${{ steps.tag.outputs.tag }}
+          push: true

Dockerfile

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+FROM golang:1.19-alpine AS builder
+LABEL maintainer="nekohasekai <[email protected]>"
+COPY . /go/src/github.com/sagernet/sing-box
+WORKDIR /go/src/github.com/sagernet/sing-box
+ARG GOPROXY=""
+ENV GOPROXY ${GOPROXY}
+ENV CGO_ENABLED=0
+RUN set -ex \
+    && apk add git build-base \
+    && export COMMIT=$(git rev-parse HEAD) \
+    && go build -v -trimpath -tags 'with_quic,with_wireguard,with_clash_api' \
+        -o /go/bin/sing-box \
+        -ldflags "-X github.com/sagernet/sing-box/constant.Commit=${COMMIT} -w -s -buildid=" \
+        ./cmd/sing-box
+FROM alpine AS dist
+LABEL maintainer="nekohasekai <[email protected]>"
+RUN [ ! -e /etc/nsswitch.conf ] && echo 'hosts: files dns' > /etc/nsswitch.conf
+RUN set -ex \
+    && apk upgrade \
+    && apk add bash tzdata ca-certificates \
+    && rm -rf /var/cache/apk/*
+COPY --from=builder /go/bin/sing-box /usr/local/bin/sing-box
+ENTRYPOINT ["sing-box"]