Use consistent formatting style in Compile Examples CI action

The previous inconsistent markup style, although perfectly valid, made the workflow harder to understand.

Author: per1234

.github/workflows/compile-examples.yml

@@ -1,5 +1,8 @@
 name: Compile Examples
-on: [push, pull_request]
+on:
+  - push
+  - pull_request
+
 jobs:
  build:
    runs-on: ubuntu-latest