ci: 🎡 add initial monorepo validation workflow for ci

.github/workflows/monorepo-validate.yaml

@@ -0,0 +1,13 @@
+name: Validate Monorepo
+on: [push]
+jobs:
+  validate:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-node@v1
+        with:
+          node-version: '12.x'
+      - run: yarn install
+      - run: yarn run compliance:licenses
+      - run: yarn audit