Fix push auth with PAT and use correct run_number in ntfy link

.gitea/workflows/auto-update.yaml

@@ -20,6 +20,12 @@ jobs:
         with:
           fetch-depth: 0
           ref: master
+          token: ${{ secrets.PUSH_TOKEN }}
+
+      - name: Configure git identity
+        run: |
+          git config user.name "gitea-runner"
+          git config user.email "gitea-runner@neet.dev"
 
       - name: Update flake inputs
         run: nix flake update --commit-lock-file
@@ -38,5 +44,5 @@ jobs:
             -H "Title: Flake auto-update failed" \
             -H "Priority: high" \
             -H "Tags: warning" \
-            -d "Auto-update workflow failed. Check: ${{ gitea.server_url }}/${{ gitea.repository }}/actions/runs/${{ gitea.run_id }}" \
-            ntfy.neet.dev/nix-flake-updates
+            -d "Auto-update workflow failed. Check: ${{ gitea.server_url }}/${{ gitea.repository }}/actions/runs/${{ gitea.run_number }}" \
+            https://ntfy.neet.dev/nix-flake-updates