Add action that builds docs

.github/workflows/build-docs.yml

@@ -0,0 +1,66 @@
+name: Build Docs
+on:
+  pull_request:
+    types: [synchronize, ready_for_review, opened]
+
+concurrency:
+  cancel-in-progress: true
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
+
+env:
+  VITE_PORTAL_API_URL: ${{ vars.VITE_PORTAL_API_URL }}
+  BUNDLE_GITHUB__COM: x-access-token:${{ secrets.BUNDLE_GITHUB__COM }}
+  TRANSLATED_CONTENT_PATH: '../../_translated_content'
+  JEKYLL_CONFIG_FILES: '../_translated_content/ja-JP/jekyll.yml,../_translated_content/ja-JP/jekyll-dev.yml'
+  LOCALE: 'ja-JP'
+
+jobs:
+  build-docs:
+    runs-on: ubuntu-latest
+    timeout-minutes: 30
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          submodules: 'recursive'
+
+      # Configure Ruby to build Jekyll site
+      - name: Set up Ruby
+        uses: ruby/setup-ruby@v1
+        with:
+          working-directory: ./docs.konghq.com
+          ruby-version: 3.3
+
+      - name: Ruby gem cache
+        uses: actions/cache@v4
+        with:
+          path: ${{ github.workspace }}/vendor/bundle
+          key: ${{ runner.os }}-gems-${{ hashFiles('**/Gemfile.lock') }}
+          restore-keys: |
+            ${{ runner.os }}-gems-
+      - name: Bundle Setup
+        run: bundle config path ${{ github.workspace }}/vendor/bundle
+      - name: Bundle Install
+        run: bundle install --jobs 4 --retry 3 --gemfile=./docs.konghq.com/Gemfile
+      # Configure Node to build assets
+      - uses: actions/setup-node@v4
+        with:
+          node-version: "20"
+      - name: Cache node modules
+        uses: actions/cache@v4
+        env:
+          cache-name: cache-node-modules
+        with:
+          path: ~/.npm
+          key: ${{ runner.os }}-build-${{ env.cache-name }}-${{ hashFiles('**/package-lock.json') }}
+          restore-keys: |
+            ${{ runner.os }}-build-${{ env.cache-name }}-
+
+      - run: |
+          cd ./docs.konghq.com
+          npm ci
+
+        # Build the Docs
+      - name: Build Docs
+        run: |
+          cd ./docs.konghq.com
+          exe/build