Enable manual triggering of build workflow

Added workflow_dispatch to allow manual builds.

Author: coffandro

.github/workflows/build.yml

@@ -3,6 +3,7 @@ name: Build and Release
 on:
   push:
     tags: ['v*']  # Only run on version tags for releases
+  workflow_dispatch: # allow manually triggering builds
 
 permissions:
   contents: write