add sparse-checkout to not copy private folder to webserver

.gitea/workflows/deploy-lectures.yml

@@ -22,9 +22,14 @@ jobs:
 
     steps:
       - name: --- CHECKOUT ---
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           path: ./tmp
+          sparse-checkout: |
+            /*
+            !.git
+            !.gitea
+          sparse-checkout-cone-mode: false
       - name: --- NOTIFY ---
         run: |
           curl \
@@ -32,4 +37,3 @@ jobs:
             -H "Content-Type: text/plain" \
             -d $'Repo: ${{ github.repository }}\nRef: ${{ github.ref }}\nStatus: ${{ job.status}}' \
             ntfy.sh/schallbert-borgmatic-catzenklebermusoelkanne
-