Enhance build workflow with manual trigger option

Added workflow_dispatch event to allow manual triggering with PHP version input.

Author: peterschade

.github/workflows/build.yml

@@ -1,6 +1,14 @@
 name: build
 
-on: [push, pull_request]
+on:
+  push:
+  pull_request:
+  workflow_dispatch:  
+    inputs:
+      php_version:
+        description: 'PHP version to run'
+        required: false
+        default: '8.3'
 
 jobs:
   run: