update deploy pipeline to ignore hidden folders

.gitea/workflows/deploy-lectures.yml

@@ -24,6 +24,7 @@ jobs:
       - name: --- CHECKOUT ---
         uses: actions/checkout@v3
         with: 
+          sparse-checkout: '!.*'
           path: ./tmp
       - name: --- NOTIFY ---
         run: |
@@ -32,4 +33,4 @@ jobs:
             -H "Content-Type: text/plain" \
             -d $'Repo: ${{ github.repository }}\nRef: ${{ github.ref }}\nStatus: ${{ job.status}}' \
             ntfy.sh/schallbert-borgmatic-catzenklebermusoelkanne
-            
+