fix: checkout main branch and push docs to main

Author: soustruh

.github/workflows/deploy.yml

@@ -20,6 +20,9 @@ jobs:
     steps:
       - name: Checkout 🛒
         uses: actions/checkout@v4
+        with:
+          ref: main
+          fetch-depth: 0
 
       - name: Install uv 💜
         uses: astral-sh/setup-uv@v6
@@ -78,4 +81,4 @@ jobs:
           git config --global user.email 'kcf@users.noreply.github.com'
           git add docs
           git commit -m "docs: update for release $TAG_VERSION 📚" || echo "No changes to commit"
-          git push
+          git push origin main