build: separate cached local and PR checks

.github/workflows/ci.yml

@@ -173,6 +173,7 @@ jobs:
 
   docs:
     name: Docs Generation
+    if: github.event_name == 'pull_request'
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
@@ -182,3 +183,8 @@ jobs:
           cache: npm
       - run: npm ci
       - run: npm run docs:check
+      - uses: actions/upload-artifact@v4
+        with:
+          name: api-docs
+          path: build/api-docs
+          retention-days: 14