Add NextJS build cache

Author: cskrov

.github/workflows/deploy-to-dev.yaml

@@ -57,11 +57,24 @@ jobs:
       - name: Test
         run: bun test
 
+      - name: Restore cache for NextJS
+        uses: actions/cache/restore@v4
+        with:
+          path: ${{ github.workspace }}/.next/cache
+          key: nextjs-${{ hashFiles('**/*.ts', '**/*.tsx') }}
+          restore-keys: nextjs-
+
       - name: Build
         env:
           VERSION: ${{ github.sha }}
         run: bun run build
 
+      - name: Save cache for NextJS
+        uses: actions/cache/save@v4
+        with:
+          path: ${{ github.workspace }}/.next/cache
+          key: nextjs-${{ hashFiles('**/*.ts', '**/*.tsx') }}
+
       - name: Upload static files to CDN
         uses: nais/deploy/actions/cdn-upload/v2@master
         with: