create a docker build process for grandpa-cw contract

.github/workflows/grandpa-cw-docker-image.yml

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+name: "Build and publish Grandpa Docker image"
+
+on:
+  push:
+    branches:
+      - '*'
+    tags:
+      - 'v*'
+
+env:
+  IMAGE_NAME: ${{ github.repository }}
+
+jobs:
+
+  build-and-publish:
+
+    name: Build & push docker image
+
+    runs-on:
+      - self-hosted
+      - x64-monster
+
+    concurrency:
+      group: grandpa-cw-image-${{ github.ref }}
+      cancel-in-progress: true
+
+    strategy:
+      fail-fast: true
+
+    steps:
+    - name: Clean up
+      continue-on-error: true
+      run: |
+        sudo chown -R $USER:$USER $GITHUB_WORKSPACE
+        docker system prune --force --all --volumes
+
+    - name: Install dependencies
+      run: |
+        sudo apt-get install -y make build-essential
+
+    - uses: actions/checkout@v2
+      with:
+        fetch-depth: 0
+
+    - name: Set up QEMU
+      uses: docker/setup-qemu-action@v3
+
+    - name: Set up Docker Buildx
+      uses: docker/setup-buildx-action@v3
+
+    - name: Extract metadata (tags, labels) for Docker
+      id: meta
+      uses: docker/metadata-action@v5
+      with:
+        images: ${{ env.IMAGE_NAME }}
+        tags: |
+          type=semver,pattern={{version}}
+          type=semver,pattern={{major}}.{{minor}}
+          type=ref,event=branch
+          type=sha,prefix={{branch}}-
+
+    - name: Login to Docker Hub
+      uses: docker/login-action@v2
+      with:
+        username: ${{ secrets.DOCKER_HUB_USERNAME }}
+        password: ${{ secrets.DOCKER_HUB_ACCESS_TOKEN }}
+
+    - name: Build and push Docker image
+      uses: docker/build-push-action@v5
+      with:
+        file: scripts/grandpa-cw.Dockerfile
+        push: ${{ github.event_name != 'pull_request' }}
+        tags: ${{ steps.meta.outputs.tags }}
+        labels: ${{ steps.meta.outputs.labels }}

scripts/grandpa-cw.Dockerfile

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+FROM paritytech/ci-unified:bullseye-1.73.0-2023-05-23 as builder
+
+WORKDIR /code
+
+COPY . .
+
+ENV PATH="/usr/local/protoc/bin:$PATH"
+
+RUN curl -LO https://github.com/protocolbuffers/protobuf/releases/download/v21.9/protoc-21.9-linux-x86_64.zip && \
+	unzip  protoc-21.9-linux-x86_64.zip -d /usr/local/protoc && \
+	protoc --version
+
+
+# The .wasm file will live in /code/target/wasm32-unknown-unknown/release/ics10_grandpa_cw.wasm
+RUN RUSTFLAGS='-C link-arg=-s' cargo build -p ics10-grandpa-cw --target=wasm32-unknown-unknown --release --lib