Build post-service Docker img in CI (#136)

.dockerignore

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+target
+service/api/bin

.github/workflows/docker.yml

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+name: Docker Build and Push
+
+on:
+  workflow_dispatch:
+  release:
+    types: [published]
+
+jobs:
+  docker-build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Git Checkout
+        uses: actions/checkout@v4
+        with:
+          submodules: true
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Login to DockerHub
+        uses: docker/login-action@v3
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+
+      - name: Build and push
+        uses: docker/build-push-action@v5
+        with:
+          context: .
+          file: ./service/Dockerfile
+          push: true
+          tags: spacemeshos/post-service:latest, spacemeshos/post-service:${{ GITHUB.SHA  }}, spacemeshos/post-service:${{ github.ref_name }}
+

service/Dockerfile

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+FROM rust:1 AS chef
+
+RUN cargo install cargo-chef
+RUN apt-get update && apt-get install -y\
+    llvm-dev \
+    libclang-dev \
+    clang \
+    cmake \
+    protobuf-compiler \
+    && rm -rf /var/lib/apt/lists/*
+
+WORKDIR /service
+
+FROM chef AS planner
+COPY . .
+RUN cargo chef prepare --recipe-path recipe.json
+
+FROM chef AS builder
+COPY --from=planner /service/recipe.json recipe.json
+RUN cargo chef cook --release -p service --recipe-path recipe.json
+
+COPY . .
+RUN cargo build --release -p service --bin service
+
+FROM debian:bookworm-slim AS runtime
+WORKDIR /service
+COPY --from=builder /service/target/release/service /usr/local/bin
+ENTRYPOINT ["/usr/local/bin/service"]