Fix for #2820 (#2830)

Make sure tests only run when push to master and pull request to master

.github/workflows/tests.yml

@@ -7,10 +7,10 @@ name: tests
 on:
   push:
     branches:
-      - "*"
+      - master
   pull_request:
     branches:
-      - "*"
+      - master
     types:
       - opened
       - reopened