First attempt

.github/workflows/deploy.yml

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+name: Deploy to GitHub Pages
+
+on:
+  push:
+    branches: ["main"]
+  workflow_dispatch:
+
+permissions:
+  contents: read
+  pages: write
+  id-token: write
+
+concurrency:
+  group: "pages"
+  cancel-in-progress: false
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Node
+        uses: actions/setup-node@v4
+        with:
+          node-version: "20"
+          cache: "npm"
+      - name: Clone Otterscan
+        run: |
+          git clone https://github.com/otterscan/otterscan.git
+
+      - name: Build Otterscan
+        run: |
+          cd otterscan
+          npm install
+          npm run build
+        env:
+          VITE_CONFIG_JSON: |
+            {
+              "erigonURL": "http://localhost:8545",
+              "chainInfo": {
+                "name": "Anvil Local DevNet",
+                "faucets": [],
+                "nativeCurrency": {
+                  "name": "Test ETH",
+                  "symbol": "tETH",
+                  "decimals": 18
+                }
+              }
+            }
+
+      - name: Upload Artifact
+        uses: actions/upload-pages-artifact@v3
+        with:
+          path: ./otterscan/dist
+
+  deploy:
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+    runs-on: ubuntu-latest
+    needs: build
+    steps:
+      - name: Deploy to GitHub Pages
+        id: deployment
+        uses: actions/deploy-pages@v4

CNAME

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+otterscan-devnet.metacrypt.org