chore: add docker gh workflow for pushing hyperlane-init image

Author: damiannolan

.github/workflows/docker.yml

@@ -0,0 +1,38 @@
+name: Build and Push Docker Image
+
+on:
+  push:
+    branches: [ main ]
+    paths:
+      - '**/Dockerfile'
+      - '.github/workflows/docker.yml'
+
+jobs:
+  build-and-push:
+    runs-on: ubuntu-latest
+
+    permissions:
+      contents: read
+      packages: write  # Required for pushing to GHCR
+
+    steps:
+      - name: Checkout source
+        uses: actions/checkout@v3
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Log in to GitHub Container Registry
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Build and push Docker image
+        uses: docker/build-push-action@v5
+        with:
+          context: .
+          file: ./hyperlane/Dockerfile
+          push: true
+          tags: ghcr.io/${{ github.repository_owner }}/hyperlane-init:latest

hyperlane/registry/chains/rethlocal/metadata.yaml

@@ -10,5 +10,5 @@ nativeToken:
   symbol: ETH
 protocol: ethereum
 rpcUrls:
-  - http: http://localhost:8545
+  - http: http://reth:8545
 technicalStack: other