ci(build-devnet): limit pull request triggers to relevant paths

Only run the devnet build workflow on pull requests when changes are detected in source code, scripts, or libraries. This optimizes CI resource usage by preventing unnecessary builds for changes in unrelated files.

Author: Quantumlyy

.github/workflows/build-devnet.yml

@@ -4,6 +4,7 @@ on:
   push:
     branches: [main]
   pull_request:
+    paths:
       - 'src/**'
       - 'scripts/**'
       - 'lib/**'