Only run Compile Examples workflow when relevant files are modified (#33)

Running the Compile Examples GitHub Actions workflow is only necessary when files under examples/ or src/, or the workflow configuration itself are modified. For any other changes, the workflow run only slows down the CI results and causes unnecessary comments from the report-size-deltas workflow.

Author: per1234

.github/workflows/compile-examples.yml

@@ -1,5 +1,17 @@
 name: Compile Examples
-on: [push, pull_request]
+
+on:
+  pull_request:
+    paths:
+      - ".github/workflows/compile-examples.yml"
+      - "examples/**"
+      - "src/**"
+  push:
+    paths:
+      - ".github/workflows/compile-examples.yml"
+      - "examples/**"
+      - "src/**"
+
 jobs:
   build:
     runs-on: ubuntu-latest