chore(PUPIL-438): add a GH worksflow to verify PRs

runs format, linting, type checks and tests on new PRs as well as main

.github/workflows/verify.yml

@@ -0,0 +1,26 @@
+name: Verify
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    types: [opened, synchronize, reopened]
+
+jobs:
+  format_and_test:
+    name: format, lint, type-check and test
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 20.x
+          cache: "npm"
+      - run: npm ci
+      - run: npm run format:check
+      - run: npm run lint
+      - run: npm run check-types
+      - run: npm run test:ci