Only create nightlies on origin repo

.github/workflows/nightly.yml

@@ -10,6 +10,7 @@ permissions:
 jobs:
   build:
     name: Build ${{ matrix.board }} (${{ matrix.build }})
+    if: github.repository == ‘technyon/nuki_hub’
     runs-on: ubuntu-latest
     strategy:
       fail-fast: false
@@ -124,4 +125,4 @@ jobs:
           skip_fetch: true
           skip_checkout: true
           disable_globbing: true
-          add_options: '-f'
+          add_options: '-f'