Manual trigger API documentation publishing using workflow_dispatch

.github/workflows/publish_api_documentation.yml

@@ -1,8 +1,7 @@
 name: publish-api-documentation
 
 on:
-  schedule:
-    - cron: "0 0 * * *"
+  workflow_dispatch:
   push:
     tags:
       - v3.*
@@ -14,8 +13,6 @@ jobs:
 
     steps:
     - uses: actions/checkout@v2
-      with:
-        ref: 3.0
     - uses: actions/setup-python@v2
       with:
         python-version: 3.6