build: run build workflow for pull requests

Author: slisson

.github/workflows/build.yaml

@@ -4,6 +4,7 @@ on:
   push:
     branches:
       - '**'
+  pull_request: {}
 
 jobs:
   build:
@@ -32,4 +33,4 @@ jobs:
           name: test-report
           path: |
             */build/test-results
-            */build/reports
+            */build/reports