Add support for Docker images

.github/workflows/build.yml

@@ -41,3 +41,34 @@ jobs:
           sshmux
           config.example.json
           sshmux.service
+  docker:
+    name: Docker
+    runs-on: ubuntu-latest
+    steps:
+      - name: Compute Docker metadata
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ghcr.io/ustc-vlab/sshmux
+          tags: |
+            type=ref,event=branch
+            type=ref,event=pr
+            type=semver,pattern={{version}}
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+      - name: Login to GHCR
+        if: startsWith(github.ref, 'refs/tags/')
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.repository_owner }}
+          password: ${{ github.token }}
+      - name: Build and push image
+        uses: docker/build-push-action@v6
+        with:
+          push: ${{ startsWith(github.ref, 'refs/tags/') }}
+          platforms: linux/amd64,linux/arm64
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}

Dockerfile

@@ -0,0 +1,11 @@
+FROM golang:1.22 AS build
+
+WORKDIR /go/src/app
+COPY . .
+
+RUN go mod download
+RUN CGO_ENABLED=0 go build -o /go/bin/sshmux
+
+FROM gcr.io/distroless/static-debian12:nonroot
+COPY --from=build /go/bin/sshmux /
+CMD ["/sshmux"]