Add manual archiving workflow to Gitea CI

- Introduced a new workflow for manual archiving, allowing users to trigger the creation of archives for the api and web directories.
- The workflow includes steps for code checkout and artifact upload with a retention policy of 7 days.

.gitea/workflows/archive.yml

@@ -0,0 +1,20 @@
+name: Ручная архивация
+
+on:
+  workflow_dispatch:  # только ручной запуск
+
+jobs:
+  create-archives:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Проверка кода
+        uses: actions/checkout@v4
+
+      - name: Загрузка артифакта
+        uses: actions/upload-artifact@v3
+        with:
+          name: build-artifacts-${{ github.run_id }}
+          path: |
+            api/
+            web/
+          retention-days: 7