Fix docs deploy not using branch input

Signed-off-by: Matthew Peveler <matt.peveler@gmail.com>

.github/workflows/deploy_docs_0x.yml

@@ -20,6 +20,7 @@ jobs:
         uses: actions/checkout@v4
         with:
           fetch-depth: 0
+          ref: ${{ github.event.inputs.branch }}
 
       - name: Push to dokku
         uses: dokku/github-action@master