Merge pull request #83158 from ethomson/patch-1

GitHub Actions: only run on master branch

.github/workflows/ci.yml

 name: CI
 
-on: [push, pull_request]
+on:
+  push:
+    branches:
+      - master
+      - release/*
+  pull_request:
+    branches:
+      - master
+      - release/*
 
 jobs:
   linux: