Add a pull request test script for GitHub Actions

Also remove useless submodule argument from checkout

.github/workflows/publish.yml

@@ -13,7 +13,6 @@ jobs:
       - uses: actions/checkout@v3
         with:
           persist-credentials: false
-          submodules: recursive
 
       - uses: ruby/setup-ruby@v1
         with:

.github/workflows/test.yml

@@ -0,0 +1,25 @@
+name: Test site build
+
+on:
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  doc-test:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v3
+        with:
+          persist-credentials: false
+
+      - uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: '3.2'
+
+      - name: Install dependencies
+        run: bundle install
+
+      - name: Run Jekyll
+        # Build the site using Jekyll
+        run: bundle exec jekyll build