Add Manual Trigger to Test Workflow

Test workflow could not be run manually. This meant for older PRs before we had actions setup, maintainers could not manually trigger tests.

.github/workflows/test.yml

@@ -8,6 +8,7 @@ on:
       - "*"
   schedule:
     - cron: "0 1 * * *"
+  workflow_dispatch:
 jobs:
   checks:
     runs-on: ubuntu-latest