copyrights.yml in factbase-0.2.1

- old
+ new

@@ -19,10 +19,14 @@
 # SOFTWARE.
 ---
 name: copyrights
 'on':
   push:
+    branches:
+      - master
   pull_request:
+    branches:
+      - master
 jobs:
   copyrights:
     runs-on: ubuntu-22.04
     steps:
       - uses: actions/checkout@v4