Add Jekyll build check

Author: glrs

.github/workflows/jekyll-build.yml

@@ -0,0 +1,31 @@
+name: Jekyll build
+
+on:
+  pull_request:
+    branches:
+      - master
+  push:
+    branches:
+      - codex/clean-update-personal-page
+
+permissions:
+  contents: read
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Check out repository
+        uses: actions/checkout@v4
+
+      - name: Set up Ruby
+        uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: "2.7"
+          bundler-cache: true
+
+      - name: Build site
+        run: bundle exec jekyll build
+        env:
+          JEKYLL_ENV: production

Gemfile.lock

@@ -240,6 +240,7 @@ GEM
 
 PLATFORMS
   aarch64-linux
+  x86_64-linux
 
 DEPENDENCIES
   github-pages