Cache Astro build assets in GitHub actions

.github/workflows/preview.yml

@@ -0,0 +1,39 @@
+name: Preview Deployment
+
+on:
+  workflow_dispatch:
+  pull_request:
+    branches: [main]
+  push:
+    branches: [main]
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+permissions: {}
+
+jobs:
+  preview:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v5
+
+      - name: Cache Astro Output
+        uses: actions/cache@v4
+        with:
+          path: content/node_modules/.astro
+          key: astro-cache-${{ hashFiles('content/src/content/**') }}
+          restore-keys: |
+            astro-cache-
+
+      - name: Install dependences
+        uses: ./.github/actions/setup
+        with:
+          working-directory: ./content
+
+      - name: Build
+        shell: bash
+        working-directory: ./content
+        run: pnpm build