Revert "ci(gitlab): install hexo globally (test)"

This reverts commit 829e1aa47b.

.gitlab-ci.yml

@@ -10,12 +10,12 @@ variables:
 test:
   before_script:
     - 'which ssh-agent || (apk update && apk add openssh-client git)'
-    - npm install -g hexo-cli
-    - npm install
+    - npm install -g pnpm
+    - pnpm install
 
   script:
-    # - npm install snyk && npm run snyk # Refer to "scripts" in package.json
-    - hexo generate
+    - pnpm install snyk && pnpm run snyk # Refer to "scripts" in package.json
+    - pnpm run hexo
 
   # Update github mirror
   after_script: