Replace deprecated jekyll action

...with a custom github action

Github seem to have completely changed how they handle deploying static
sites

Author: dgmstuart

.github/workflows/github-pages.yml

@@ -3,25 +3,52 @@ name: Build and deploy Jekyll site to GitHub Pages
 on:
   push:
     branches:
-      - main
+      - "main"
+  workflow_dispatch:
 
-jobs:
-  github-pages:
-    runs-on: ubuntu-latest
+permissions:
+  contents: "read"
+  pages: "write"
+  id-token: "write"
+
+concurrency:
+  group: "pages"
+  cancel-in-progress: false
 
+jobs:
+  build:
+    runs-on: "ubuntu-latest"
     steps:
-      - name: Checkout repo
-        uses: actions/checkout@v5
+      - name: "Checkout repo"
+        uses: "actions/checkout@v5"
 
-      - name: Get cached gems
-        uses: actions/cache@v5
+      - name: "Setup Ruby"
+        uses: "ruby/setup-ruby@v1"
         with:
-          path: vendor/bundle
-          key: ${{ runner.os }}-gems-${{ hashFiles('**/Gemfile.lock') }}
-          restore-keys: |
-            ${{ runner.os }}-gems-
-      - name: Build and deploy
-        uses: helaili/jekyll-action@v2
+          bundler-cache: true
+
+      - name: "Setup Pages"
+        id: "pages"
+        uses: "actions/configure-pages@v5"
+
+      - name: "Build with Jekyll"
+        run: 'bundle exec jekyll build --baseurl "${{ steps.pages.outputs.base_path }}"'
+        env:
+          JEKYLL_ENV: "production"
+
+      - name: "Upload Pages artifact"
+        uses: "actions/upload-pages-artifact@v3"
         with:
-          token: ${{ secrets.GITHUB_TOKEN }}
-          target_branch: 'gh-pages'
+          path: "_site"
+
+  deploy:
+    runs-on: "ubuntu-latest"
+    needs: "build"
+    environment:
+      name: "github-pages"
+      url: "${{ steps.deployment.outputs.page_url }}"
+    steps:
+      - name: "Deploy to GitHub Pages"
+        id: "deployment"
+        uses: "actions/deploy-pages@v4"
+