ci: add nightly workflow

.github/workflows/nightly.yml

@@ -0,0 +1,24 @@
+name: nightly
+
+on:
+  push:
+    paths:
+      - "languages/**"
+      - "templates/**"
+      - "sportorg/**"
+      - "poetry.lock"
+    branches: [ master ]
+  workflow_dispatch:
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+    permissions:
+      id-token: write
+      contents: read
+      repository-projects: write
+    steps:
+      - name: Tag branch
+        run: |
+          git tag -f -a nightly -m ""
+          git push -f origin nightly