ci: add basic CI test workflow

Author: serhalp

.github/workflows/test.yml

@@ -0,0 +1,20 @@
+name: All Tests
+
+on: [push, pull_request]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+      - name: Set up PNPM
+        run: corepack enable
+      - name: Set up Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: 22.x
+          cache: "pnpm"
+      - run: pnpm install
+
+      - run: pnpm run test