Enhance booking time management by adding configurable time slots and improve sync workflow error handling

.github/workflows/sync-to-public.yml

@@ -10,12 +10,23 @@ jobs:
   sync:
     runs-on: ubuntu-latest
     steps:
+      - name: Check if token is set
+        run: |
+          if [ -z "${{ secrets.PUBLIC_REPO_TOKEN }}" ]; then
+            echo "❌ ERROR: PUBLIC_REPO_TOKEN secret is not set!"
+            exit 1
+          else
+            echo "✅ PUBLIC_REPO_TOKEN is set"
+          fi
+
       - name: Checkout
         uses: actions/checkout@v4
         with:
           fetch-depth: 0
 
       - name: Remove sync workflow and push to public repo
+        env:
+          TOKEN: ${{ secrets.PUBLIC_REPO_TOKEN }}
         run: |
           # Configure git
           git config user.name "github-actions[bot]"
@@ -28,6 +39,6 @@ jobs:
           git rm .github/workflows/sync-to-public.yml
           git commit -m "Remove sync workflow for public repo"
 
-          # Push to public repo
-          git remote add public https://x-access-token:${{ secrets.PUBLIC_REPO_TOKEN }}@github.com/wiestju/anny-booking-automation.git
+          # Push to public repo using env var (more secure)
+          git remote add public "https://x-access-token:${TOKEN}@github.com/wiestju/anny-booking-automation.git"
           git push public temp-sync-branch:main --force