add docker image

.github/workflows/build.yml

@@ -0,0 +1,47 @@
+on:
+  push:
+    branches-ignore:
+      - '**'
+    tags:
+      - 'v*'
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+        name: Checkout
+      - uses: docker/metadata-action@v3
+        id: meta
+        with:
+          images: ghcr.io/mii443/signaling-server
+          tags: |
+            type=semver,pattern={{version}}
+            type=semver,pattern={{major}}.{{minor}}
+      - uses: docker/login-action@v1
+        with:
+          registry: ghcr.io
+          username: mii443
+          password: ${{ secrets.GITHUB_TOKEN }}
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v1
+
+      - name: Cache Docker layers
+        uses: actions/cache@v2
+        with:
+          path: /tmp/.buildx-cache
+          key: ${{ runner.os }}-buildx-${{ github.sha }}
+          restore-keys: |
+            ${{ runner.os }}-buildx-
+
+      - uses: docker/build-push-action@v2
+        with:
+          context: .
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          cache-from: type=local,src=/tmp/.buildx-cache
+          cache-to: type=local,dest=/tmp/.buildx-cache-new,mode=max
+      - name: Move cache
+        run: |
+          rm -rf /tmp/.buildx-cache
+          mv /tmp/.buildx-cache-new /tmp/.buildx-cache

Dockerfile

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+FROM lukemathwalker/cargo-chef:latest-rust-1.80.1 AS chef
+WORKDIR app
+
+FROM chef AS planner
+COPY . .
+RUN cargo chef prepare --recipe-path recipe.json
+
+FROM chef AS builder
+COPY --from=planner /app/recipe.json recipe.json
+RUN apt-get update && apt-get install -y --no-install-recommends libssl-dev pkg-config gcc && apt-get -y clean
+RUN cargo chef cook --release --recipe-path recipe.json
+COPY . .
+RUN cargo b -r --bin signaling-server
+
+FROM ubuntu:22.04 AS runtime
+WORKDIR /signaling-server
+RUN apt-get update && apt-get install -y --no-install-recommends openssl ca-certificates libssl-dev && apt-get -y clean
+COPY --from=builder /app/target/release/signaling-server /usr/local/bin
+ENTRYPOINT ["/usr/local/bin/signaling-server"]