chore(ci): add check that extension will build on PRs (#58)

.github/workflows/build.yml

@@ -0,0 +1,35 @@
+name: Build
+
+on:
+  pull_request:
+  merge_group:
+  push:
+    branches:
+      - master
+
+# This will cancel previous runs when a branch or PR is updated
+concurrency:
+  group: ${{ github.workflow }}-${{ github.head_ref || github.ref || github.run_id }}
+  cancel-in-progress: true
+
+jobs:
+  build:
+    name: build
+    runs-on: ubuntu-latest
+    timeout-minutes: 30
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - uses: actions/setup-node@v3
+        with:
+          node-version: 18.17.1
+          cache: 'npm'
+          cache-dependency-path: 'package-lock.json'
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Build extension
+        run: npm run package