fix gh-static-pages action (#79)

.github/workflows/gh-pages-static.yml

@@ -1,12 +1,7 @@
-# Simple workflow for deploying static content to GitHub Pages
+# Workflow to invoke from another workflow to deploy static content to GitHub Pages
 name: Deploy static content to Pages
 
 on:
-  # Runs on pushes targeting the default branch
-  push:
-    branches: ["gh-pages"]
-
-  # Enable it to be invoked from other workflows
   workflow_call:
 
 # Sets permissions of the GITHUB_TOKEN to allow deployment to GitHub Pages
@@ -22,7 +17,6 @@ concurrency:
   cancel-in-progress: false
 
 jobs:
-  # Single deploy job since we're just deploying
   deploy:
     environment:
       name: github-pages
@@ -31,6 +25,8 @@ jobs:
     steps:
       - name: Checkout
         uses: actions/checkout@v4
+        with:
+          ref: gh-pages
       - name: Setup Pages
         uses: actions/configure-pages@v5
       - name: Upload artifact