Update: 以下のメッセージが出力されるため、明示的にバージョンを指定

build
ubuntu-latest pipelines will use ubuntu-24.04 soon. For more details, see actions/runner-images#10636
deploy
ubuntu-latest pipelines will use ubuntu-24.04 soon. For more details, see actions/runner-images#10636

.github/workflows/jekyll.yml

@@ -28,7 +28,7 @@ concurrency:
 
 jobs:
   build:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-24.04
     steps:
       - name: Checkout
         uses: actions/checkout@v4
@@ -89,7 +89,7 @@ jobs:
     environment:
       name: github-pages
       url: ${{ steps.deployment.outputs.page_url }}
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-24.04
     needs: build
     steps:
       - name: Deploy to GitHub Pages