Publish docker image, fixes for tests of 128/160/256 bit numbers

.dockerignore

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+**/target
+.git/

.github/workflows/publish-image.yml

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+name: Publish docker image
+
+on:
+  workflow_dispatch:
+    inputs:
+      image_tag:
+        description: 'Image (to be built/pushed) tag (default: latest)'
+        default: "latest"
+        type: string
+        required: false
+      ref_to_geth:
+        description: 'Branch, tag or commit SHA1 to checkout fhevm-backend'
+        required: true
+        default: "main"
+        type: string
+
+env:
+  DOCKER_IMAGE: ghcr.io/zama-ai/coprocessor
+
+jobs:
+  push_to_registry:
+    name: Push Docker image to GitHub Container Registry
+    runs-on: ubuntu-latest
+    permissions:
+      packages: write
+    steps:
+      # space wasn't enough at some point
+      - name: Free Disk Space (Ubuntu)
+        uses: jlumbroso/free-disk-space@54081f138730dfa15788a46383842cd2f914a1be
+
+      - name: Check out repo
+        uses: actions/checkout@v4
+        with:
+          token: ${{ secrets.SUBMODULES_CHECKOUT_TOKEN }}
+          ref: ${{ inputs.ref_to_geth }}
+          lfs: true
+          submodules: recursive
+
+      - name: Check OS
+        run: |
+          lscpu
+          uname -r
+          lsb_release -a
+
+      - name: Login to GitHub Container Registry
+        uses: docker/login-action@49ed152c8eca782a232dede0303416e8f356c37b
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: List files in the repository
+        run: |
+          ls ${{ github.workspace }}
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+        with:
+          platforms: linux/amd64,linux/arm64
+
+      - name: Build and push Docker image
+        uses: docker/build-push-action@v5
+        with:
+          context: .
+          file: fhevm-engine/coprocessor/Dockerfile
+          push: true
+          pull: true
+          platforms: linux/amd64,linux/arm64
+          tags: ${{ env.DOCKER_IMAGE }}:${{ inputs.image_tag }},${{ env.DOCKER_IMAGE }}:latest