Only run tests for changed files in CI, too

Author: defaude

.github/workflows/Ci.yml

@@ -21,7 +21,7 @@ jobs:
         run: npm ci
 
       - name: 🧪 Run tests
-        run: npm test
+        run: npm run test-changed
 
       - name: 💄 Code style
         run: npm run style