Use 24.04 image to use Podman

Author: gbraad

.github/workflows/gh-pages.yml

@@ -11,14 +11,14 @@ jobs:
       fail-fast: false
       matrix:
         os:
-          - ubuntu-latest
+          - ubuntu-24.04
     steps:
       - name: Check out repository code
         uses: actions/checkout@v4
       - name: Build docs
-        run: CONTAINER_RUNTIME=docker CI=true make build_docs
+        run: CI=true make build_docs
       - name: Check links in docs
-        run: CONTAINER_RUNTIME=docker make docs_check_links
+        run: make docs_check_links
       - name: Deploy
         uses: peaceiris/actions-gh-pages@v4
         if: github.ref == 'refs/heads/main'