Triggers build on main branch changes

Updates workflow to trigger on pushes to the main branch when pyproject.toml is modified, in addition to manual dispatch.

Improves automation by ensuring builds occur for relevant changes.

.github/workflows/build-deb.yml

@@ -1,7 +1,12 @@
 name: Build Wheels
 
 on:
-  workflow_dispatch: # <-- Nur manuell über GitHub startbar
+  workflow_dispatch:
+  push:
+    branches:
+      - main
+    paths:
+      - "pyproject.toml"
 
 jobs:
   build: