ci: restore state before switching branches

Author: gadomski

.github/workflows/docs.yml

@@ -4,6 +4,7 @@ on:
   push:
     branches:
       - gh-pages
+      - main
     tags:
       - "v*"
   workflow_dispatch:
@@ -26,7 +27,7 @@ jobs:
           GIT_COMMITTER_NAME: ci-bot
           GIT_COMMITTER_EMAIL: [email protected]
       - name: Checkout gh-pages
-        run: git checkout gh-pages
+        run: git restore . && git checkout gh-pages
       - uses: actions/upload-pages-artifact@v3
         id: deployment
         with: