Set robots meta tag content "noindex, nofollow" for gh-pages preview

.github/workflows/export-static-site.yml

@@ -44,7 +44,7 @@ jobs:
 
       - name: Setup Pages
         id: pages
-        uses: actions/configure-pages@v4
+        uses: actions/configure-pages@v5
 
       - name: Run "docker compose up" to export static site for RiskProfiler
         run: |
@@ -53,11 +53,6 @@ jobs:
           export OPTIONS_GIT_DESCRIBE=$(git describe --long --tags)
           docker compose up --abort-on-container-exit --exit-code-from wpcli
 
-      - name: Upload Pages artifact
-        uses: actions/upload-pages-artifact@v3
-        with:
-          path: html_static/riskprofiler
-
       - name: Upload debug log artifact
         uses: actions/upload-artifact@v4
         with:
@@ -82,6 +77,17 @@ jobs:
           tags: true
           draft: false
 
+      - name: Discourage search engines from indexing this preview site
+        run: |
+          for i in $(grep -lr '^<meta name="robots"' html_static/riskprofiler); do
+            sed -i '/^<meta name="robots"/s/content="[^"]\+"/content="noindex, nofollow"/' $i
+          done
+
+      - name: Upload Pages artifact
+        uses: actions/upload-pages-artifact@v3
+        with:
+          path: html_static/riskprofiler
+
   # Deployment job
   deploy:
     # Add a dependency to the build job