build: add db-migration docker image

.github/workflows/fhevm-db-migration.yml

@@ -0,0 +1,46 @@
+name: "fhEVM DB migtaion Docker Image"
+
+on:
+  push:
+    branches:
+      - main
+      - ci/db-migration
+    paths:
+      - .github/workflows/fhevm-coprocessor.yml
+      - .github/workflows/common-docker.yml
+      - fhevm-engine/fhevm-db/**
+  release:
+    types:
+      - published
+
+concurrency:
+  group: fhevm-coprocessor-${{ github.ref_name }}
+  cancel-in-progress: false
+
+jobs:
+  docker-coprocessor:
+    uses: ./.github/workflows/common-docker.yml
+    permissions:
+      contents: "read"
+      id-token: "write"
+      packages: "write"
+    with:
+      working-directory: "."
+      push_image: ${{ github.event_name == 'release' || github.ref_name == 'main' }}
+      image-name: "fhevm-db-migration"
+      generate-dev-image: false
+      docker-file: "fhevm-engine/fhevm-db/Dockerfile"
+      arm-build: true
+
+    secrets:
+      BLOCKCHAIN_ACTIONS_TOKEN: ${{ secrets.BLOCKCHAIN_ACTIONS_TOKEN }}
+      GRAVITON_BUILDER_SSH_PRIVATE_KEY: ${{ secrets.GRAVITON_BUILDER_SSH_PRIVATE_KEY }}
+
+  done:
+    runs-on: ubuntu-latest
+    name: Pipeline Done
+    steps:
+      - name: Success
+        run: echo Pipeline Done
+    needs:
+      - docker-coprocessor