Add ability to run check manually.

.github/workflows/check-pr.yml

@@ -5,6 +5,11 @@ on:
       - master
     paths:
       - _data/signed/*
+  workflow_dispatch:
+    inputs:
+      names:
+        description: 'Check signatures'
+        required: false
 jobs:
   deploy:
     runs-on: ubuntu-latest