Add Docker-based CI/CD workflow for publishing (#3)

.dockerignore

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+.git/
+.idea/
+target/

.github/workflows/publish.yml

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+name: release
+
+on:
+  workflow_dispatch:
+  push:
+    branches:
+      - hotfix
+    tags:
+      - "v*"
+
+env:
+  CARGO_TERM_COLOR: always
+  REGISTRY: ghcr.io
+
+jobs:
+  publish:
+    runs-on: ubuntu-latest
+
+    permissions:
+      contents: read
+      packages: write
+      attestations: write
+      id-token: write
+
+    steps:
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Cache Docker layers
+        uses: actions/cache@v4
+        with:
+          path: /tmp/.buildx-cache
+          key: ${{ runner.os }}-buildx-${{ github.ref_name }}-${{ github.sha }}
+          restore-keys: |
+            ${{ runner.os }}-buildx-${{ github.ref_name }}
+            ${{ runner.os }}-buildx-
+
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Log in to the Container registry
+        uses: docker/login-action@v3
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Extract metadata (tags, labels) for Docker
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ${{ env.REGISTRY }}/${{ github.repository  }}
+
+      - name: Build and push Docker image
+        id: push
+        uses: docker/build-push-action@v6
+        with:
+          context: .
+          file: ./Dockerfile
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+
+      - name: Generate artifact attestation
+        uses: actions/attest-build-provenance@v1
+        with:
+          subject-name: ${{ env.REGISTRY }}/${{ github.repository }}
+          subject-digest: ${{ steps.push.outputs.digest }}
+          push-to-registry: true
+
+      - # Temp fix
+        # https://github.com/docker/build-push-action/issues/252
+        # https://github.com/moby/buildkit/issues/1896
+        name: Move cache
+        run: |
+          rm -rf /tmp/.buildx-cache
+          mv /tmp/.buildx-cache-new /tmp/.buildx-cache

Dockerfile

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+FROM rust:1-alpine AS chef
+RUN rustup install 1.79.0
+RUN rustup component add cargo clippy rust-docs rust-std rustc rustfmt
+
+# Use apk for package management in Alpine
+RUN apk add --no-cache build-base libressl-dev
+RUN cargo install cargo-chef
+
+FROM chef AS planner
+
+WORKDIR /app
+COPY . .
+RUN cargo chef prepare --recipe-path recipe.json
+
+FROM chef AS builder
+
+WORKDIR /app
+COPY --from=planner /app/recipe.json recipe.json
+# Build dependencies - this is the caching Docker layer!
+RUN cargo chef cook --release --recipe-path recipe.json
+RUN cargo build --release
+
+# Build application
+COPY . .
+ENV PATH="/root/.cargo/bin:${PATH}"
+
+RUN cargo build --release
+
+FROM rust:1-alpine
+
+WORKDIR /
+
+COPY --from=builder /app/target/release/vrf_demo-rpc-server /usr/local/bin/server
+
+EXPOSE 3000
+
+ENTRYPOINT [ "server" ]