feat: Add Sepolia deployment workflow

- Add separate GitHub Actions workflow for Sepolia testnet
- Configure deployment to trigger on sepolia branch pushes
- Update git commands to pull from sepolia branch
- Maintain separate deployment pipeline from mainnet

.github/workflows/deploy.sepolia.yml

@@ -0,0 +1,36 @@
+name: Deploy to Remote Server
+
+on:
+  push:
+    branches:
+      - sepolia-db
+
+jobs:
+  deploy:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: SSH into Remote Server and Deploy Changes
+        uses: appleboy/[email protected]
+        with:
+          host: ec2-3-87-142-202.compute-1.amazonaws.com
+          username: ubuntu
+          key: ${{ secrets.SSH_PRIVATE_KEY }}
+          passphrase: ${{ secrets.SSH_PASSPHRASE }}
+          port: 22
+          script: |
+            # Navigate to the project directory
+            cd ~/fossil-headers-db
+
+            # Pull the latest changes from the main branch
+            git fetch origin main
+            git reset --hard origin/main
+
+            # Ensure Docker and Docker Compose are installed
+            docker --version || { echo "Docker not found"; exit 1; }
+            docker-compose --version || { echo "Docker Compose not found"; exit 1; }
+
+            # Build and run the Docker Compose services for Sepolia
+            docker-compose -f docker-compose.sepolia.yml down
+            docker-compose -f docker-compose.sepolia.yml build --no-cache
+            docker-compose -f docker-compose.sepolia.yml up -d

docker-compose.sepolia.yml

@@ -0,0 +1,45 @@
+version: '3.8'
+
+services:
+  update:
+    build:
+      dockerfile: Dockerfile.update
+      context: .
+    ports:
+      - "8081:8080"
+    environment:
+      - DB_CONNECTION_STRING=${SEPOLIA_DB_STRING}
+      - NODE_CONNECTION_STRING=${SEPOLIA_NODE_STRING}
+      - ROUTER_ENDPOINT=${SEPOLIA_ROUTER_ENDPOINT}
+      - RUST_LOG=info
+    depends_on:
+      db:
+        condition: service_healthy
+
+  fix:
+    build:
+      dockerfile: Dockerfile.fix
+      context: .
+    environment:
+      - DB_CONNECTION_STRING=${SEPOLIA_DB_STRING}
+      - NODE_CONNECTION_STRING=${SEPOLIA_NODE_STRING}
+      - ROUTER_ENDPOINT=${SEPOLIA_ROUTER_ENDPOINT}
+      - RUST_LOG=info
+      - INTERVAL=${FIX_INTERVAL:-300}
+    depends_on:
+      db:
+        condition: service_healthy
+
+  db:
+    image: postgres:16-alpine
+    environment:
+      - POSTGRES_USER=${POSTGRES_USER}
+      - POSTGRES_PASSWORD=${POSTGRES_PASSWORD}
+      - POSTGRES_DB=${SEPOLIA_POSTGRES_DB}
+    ports:
+      - "5432:5432"
+    healthcheck:
+      test: ["CMD-SHELL", "pg_isready -U ${POSTGRES_USER}"]
+      interval: 5s
+      timeout: 5s
+      retries: 5