add basic ci for testing if build fails

.github/workflows/build.yml

@@ -0,0 +1,20 @@
+name: Build on push
+on:
+  push:
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v3
+    - uses: pnpm/action-setup@v2
+      with:
+        version: 8
+    - name: Use Node.js 20
+      uses: actions/setup-node@v3
+      with:
+        node-version: 20
+        cache: 'pnpm'
+    - name: Install dependencies
+      run: pnpm install
+    - name: Build all
+      run: pnpm -r build