Run sauce tests only on merge

Author: dgrammatiko

.github/workflows/remote-tests.yml

@@ -1,12 +1,15 @@
 name: SauceLabs Browser Testing
 
 on:
-  push
+  pull_request:
+    branches:
+      - master
+    types: [closed]
 
 jobs:
   test:
     runs-on: ubuntu-latest
-    if: "contains(github.event.pull_request.labels.*.name, 'runTests')"
+    if: github.event_name == 'pull_request' && github.event.action == 'closed' && github.event.pull_request.merged == true
 
     steps:
     - uses: actions/checkout@v2