Enable unit tests in GH Actions

.github/workflows/keda-verify.yml

@@ -25,4 +25,11 @@ jobs:
         with:
           version: latest
           working-directory: '.'
-
+  # pre-keda-manager-operator-tests
+  unit-test:
+    if: github.event_name == 'pull_request'
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: run test
+        run: make test