Allow manual dispatch of Test CI job

(cherry picked from commit bcc7192af7406f6acd75a7c9c45eb9cf36650fab)

.github/workflows/test.yml

@@ -6,6 +6,7 @@ on:
       - master
       - release-v*
   pull_request: {}
+  workflow_dispatch: {}
 
 jobs:
   test: