ci(preview): Fix if condition to allow workflow_dispatch event

Author: xeho91

.github/workflows/cr_preview.yml

@@ -16,7 +16,7 @@ jobs:
         name: pkg.pr.new
         runs-on: macos-latest
         timeout-minutes: 5
-        if: github.event_name == 'pull_request'
+        if: github.event_name == 'pull_request' || github.event_name == 'workflow_dispatch'
         steps:
             # https://github.com/actions/checkout
             - uses: actions/checkout@v4