chore: add basic ci tests

.github/workflows/ci-core-tests.yml

@@ -0,0 +1,23 @@
+name: core-tests
+
+on:
+  pull_request:
+    types: [
+        # Default pull_request trigger types.
+        opened,
+        synchronize,
+        reopened,
+      ]
+  push:
+    branches: [main]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+       - name: Checkout
+         uses: actions/checkout@v4
+
+       - name: Validate syntax
+         run: bash -n *.sh