Update docs deployment workflow

Signed-off-by: Geert Eltink <[email protected]>

Author: geerteltink

.github/workflows/docs-build.yml

@@ -1,9 +1,8 @@
 name: docs-build
 
 on:
-  push:
-    branches:
-      - master
+  release:
+    types: [published]
   repository_dispatch:
     types: docs-build
 
@@ -14,4 +13,5 @@ jobs:
       - name: Build Docs
         uses: laminas/documentation-theme/github-actions/docs@master
         env:
-          DOCS_DEPLOY_KEY: ${{ secrets.DOCS_DEPLOY_KEY }}
+          "DOCS_DEPLOY_KEY": ${{ secrets.DOCS_DEPLOY_KEY }}
+          "GITHUB_TOKEN": ${{ secrets.GITHUB_TOKEN }}