feat: add cname-prefix package

Author: nd0ut

.github/workflows/checks.yml

@@ -34,6 +34,8 @@ jobs:
               - 'packages/signed-uploads/**'
             image-shrink:
               - 'packages/image-shrink/**'
+            cname-prefix:
+              - 'packages/cname-prefix/**'
       - name: Install dependencies
         working-directory: ./
         run: npm i