diff --git a/.gitea/workflows/ci-cd.yml b/.gitea/workflows/ci-cd.yml
index 88c5f35..81a901d 100644
--- a/.gitea/workflows/ci-cd.yml
+++ b/.gitea/workflows/ci-cd.yml
@@ -28,7 +28,11 @@ jobs:
         run: |
           npm ci \
             --registry="https://package-mirror.liara.ir/repository/npm/" \
-            --replace-registry-host=registry.npmjs.org
+            --replace-registry-host=registry.npmjs.org \
+            --include=optional
+
+      - name: Verify image optimizer dependency
+        run: node -e "const sharp = require('sharp'); if (!sharp.format.webp.output) throw new Error('Sharp WebP output is unavailable')"
 
       - name: Lint
         run: npm run lint
diff --git a/Dockerfile b/Dockerfile
index cab7d75..0ba0247 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -7,7 +7,8 @@ ARG NPM_REGISTRY=https://package-mirror.liara.ir/repository/npm/
 COPY package.json package-lock.json ./
 RUN npm ci \
   --registry="${NPM_REGISTRY}" \
-  --replace-registry-host=registry.npmjs.org
+  --replace-registry-host=registry.npmjs.org \
+  --include=optional
 
 COPY . .
 RUN npm run build