Add CI build check

.github/renovate.json

@@ -0,0 +1,18 @@
+{
+  "extends": ["config:base"],
+  "automerge": true,
+  "automergeType": "pr",
+  "labels": ["dependencies"],
+  "rangeStrategy": "bump",
+  "packageRules": [
+    {
+      "matchPackagePatterns": ["*"],
+      "enabled": false
+    },
+    {
+      "matchPackageNames": ["@squidcloud/backend", "@squidcloud/cli"],
+      "groupName": "Squid backend dependencies",
+      "enabled": true
+    }
+  ]
+}

.github/workflows/build.yml

@@ -0,0 +1,30 @@
+name: Build
+
+on:
+  push:
+    branches-ignore:
+      - main
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check out repo
+        uses: actions/checkout@v3
+
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: '3.14'
+
+      - name: Install Python dependencies
+        run: pip install -r requirements.txt
+
+      - name: Install dependencies
+        run: npm install
+
+      - name: Install backend dependencies
+        run: npm install
+
+      - name: Build backend
+        run: npm run build