feat: update Jekyll workflow to use devcontainer for consistent testing and building

Author: SabotageAndi

.github/workflows/jekyll.yml

@@ -1,5 +1,6 @@
 # Combined workflow for testing and deploying Jekyll site to GitHub Pages
 # Tests must pass before deployment proceeds
+# Uses devcontainer for consistent environment between local dev and CI
 
 name: Test and Deploy Jekyll site to Pages
 
@@ -32,41 +33,51 @@ concurrency:
   cancel-in-progress: false
 
 jobs:
-  # Test job - runs Playwright tests on Windows (matches local dev environment)
+  # Test job - runs Playwright tests using devcontainer for consistent environment
   test:
     timeout-minutes: 60
-    runs-on: windows-latest
+    runs-on: ubuntu-latest
     steps:
       - name: Checkout
         uses: actions/checkout@v4
 
-      - name: Setup Ruby
-        uses: ruby/setup-ruby@v1
-        with:
-          ruby-version: '3.1'
-          bundler-cache: true
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
 
-      - name: Setup Node.js
-        uses: actions/setup-node@v4
+      - name: Build devcontainer
+        uses: devcontainers/ci@v0.3
         with:
-          node-version: '20'
-          cache: 'npm'
-
-      - name: Install Node dependencies
-        run: npm ci
-
-      - name: Install Playwright Browsers
-        run: npx playwright install --with-deps chromium
-
-      - name: Run Playwright tests
+          imageName: dotnetdevs-austria-devcontainer
+          cacheFrom: dotnetdevs-austria-devcontainer
+          push: never
+          runCmd: |
+            echo "📦 Installing dependencies..."
+            bundle install
+            npm ci
+            npx playwright install --with-deps chromium
+
+      - name: Run Playwright tests in devcontainer
         if: ${{ !inputs.update_snapshots }}
-        run: npx playwright test
+        uses: devcontainers/ci@v0.3
+        with:
+          imageName: dotnetdevs-austria-devcontainer
+          cacheFrom: dotnetdevs-austria-devcontainer
+          push: never
+          runCmd: |
+            npm run test:ci
         env:
           BASE_URL: http://127.0.0.1:4000
 
-      - name: Update Playwright Snapshots
+      - name: Update Playwright Snapshots in devcontainer
         if: ${{ inputs.update_snapshots }}
-        run: npx playwright test --update-snapshots
+        uses: devcontainers/ci@v0.3
+        with:
+          imageName: dotnetdevs-austria-devcontainer
+          cacheFrom: dotnetdevs-austria-devcontainer
+          push: never
+          runCmd: |
+            bundle exec jekyll build
+            npx playwright test --update-snapshots
         env:
           BASE_URL: http://127.0.0.1:4000
 
@@ -96,7 +107,7 @@ jobs:
             tests/**/*.txt
           retention-days: 30
 
-  # Build job - only runs after tests pass
+  # Build job - uses devcontainer, only runs after tests pass
   build:
     runs-on: ubuntu-latest
     needs: test
@@ -105,18 +116,21 @@ jobs:
     steps:
       - name: Checkout
         uses: actions/checkout@v4
-      - name: Setup Ruby
-        uses: ruby/setup-ruby@v1
-        with:
-          ruby-version: '3.1'
-          bundler-cache: true
+
       - name: Setup Pages
         id: pages
         uses: actions/configure-pages@v5
-      - name: Build with Jekyll
-        run: bundle exec jekyll build --baseurl "${{ steps.pages.outputs.base_path }}"
+
+      - name: Build with Jekyll in devcontainer
+        uses: devcontainers/ci@v0.3
+        with:
+          push: never
+          runCmd: |
+            bundle install
+            bundle exec jekyll build --baseurl "${{ steps.pages.outputs.base_path }}"
         env:
           JEKYLL_ENV: production
+
       - name: Upload artifact
         uses: actions/upload-pages-artifact@v3