Add test-2.0.yml workflow to work around GitHub bug

Apparently GitHub did not properly detect the deletion of test-2.0.yml and
support advised me to re-create the workflow to delete it again.

Author: TimWolla

.github/workflows/test-2.0.yml

@@ -0,0 +1,8 @@
+name: "Work around GitHub bug"
+on:
+  workflow_dispatch:
+jobs:
+  Hello:
+    runs-on: ubuntu-latest
+    steps:
+      - run: true