fix: preserve Next.js deploy cache

.gitea/workflows/deploy.yaml

@@ -28,12 +28,13 @@ jobs:
           git fetch origin --prune
           git reset --hard origin/main
           
-          # REMOVE OLD CACHE AND BUILDS
-          rm -rf .next .output dist
+          # Preserve .next/cache so Next.js can reuse its incremental build cache.
+          # next build safely refreshes stale server/static output itself.
+          rm -rf .output dist
           
           # 4. Configure trusted dependencies globally and install cleanly
           export PNPM_CONFIG_ONLY_BUILT_DEPENDENCIES="@parcel/watcher,@swc/core,sharp"
-          pnpm install
+          pnpm install --frozen-lockfile
           
           # 5. Apply versioned CMS migrations and generate the Prisma client safely
           pnpm db:migrate
@@ -57,4 +58,4 @@ jobs:
             exit 1
           fi
           
-          echo "--- Deployment successfully completed ---"
+          echo "--- Deployment successfully completed ---"