hack: make workflow_dispatch work

Author: maxmoehl

.github/workflows/test-sample-apps.yml

@@ -27,8 +27,8 @@ jobs:
           exit 1
       - name: Checkout
         uses: actions/checkout@v3
-        with:
-          ref: "refs/pull/${{ github.event.number }}/merge"
+        # with:
+        #   ref: "refs/pull/${{ github.event.number }}/merge"
       - name: Setup java/jdk
         uses: actions/setup-java@v3
         with: