add cloak build workflow (#1240)

* add cloak build workflow

* fix zizmor warnings

Author: Thegaram

.github/workflows/cloak.yml

@@ -0,0 +1,33 @@
+name: Cloak Docker
+
+on:
+  workflow_dispatch:
+
+jobs:
+  docker:
+    runs-on: ubuntu-latest
+    permissions: {}
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          persist-credentials: false
+
+      - name: Log in to Docker Hub
+        uses: docker/login-action@184bdaa0721073962dff0199f1fb9940f07167d1 # v3.5.0
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+
+      - name: Extract commit digest
+        id: vars
+        run: echo "sha8=${GITHUB_SHA::8}" >> $GITHUB_OUTPUT
+
+      - name: Build and Push Docker image
+        uses: docker/build-push-action@263435318d21b8e681c14492fe198d362a7d2c83 # v6.18.0
+        with:
+          context: .
+          platforms: linux/amd64
+          push: true
+          tags: scrolltech/cloak-l2geth:${{ steps.vars.outputs.sha8 }}