Add docs archive checkout.

.github/workflows/docs.yml

@@ -30,13 +30,12 @@ jobs:
       run: |
         git checkout gh-pages-v0.3.x
         git pull
+        git checkout gh-pages
         mkdir ./v0.3.x
         git archive gh-pages-v0.3.x | tar -x -C ./v0.3.x
         git add --all
         git commit -am "Adding v0.3.x docs"
-        cd v0.3.x
         ls -la
-        git checkout gh-pages
     - name: Push changes
       uses: ad-m/github-push-action@master
       with: