Update GitHub Actions CI workflow triggers.

Author: jaydenseric

.github/workflows/ci.yml

@@ -1,5 +1,9 @@
 name: CI
-on: [push, workflow_dispatch]
+on:
+  push:
+    branches: [master]
+  pull_request:
+  workflow_dispatch:
 jobs:
   prettier:
     name: Prettier

changelog.md

@@ -14,6 +14,7 @@
   - Reordered and renamed scripts.
   - Replaced `npm run` with `node --run`.
 - Updated GitHub Actions CI config:
+  - Updated workflow triggers.
   - Run checks in separate jobs.
   - Removed custom step names.
   - Updated `actions/checkout` to v5.