fix(e2e): remove cache option from setup-node action and update .gitignore to include .secret

Author: Ansonhkg

.github/workflows/e2e-naga.yml

@@ -63,7 +63,6 @@ jobs:
         with:
           node-version: 22.18.0
           registry-url: https://registry.npmjs.org
-          cache: pnpm
       - name: Enable corepack + pin pnpm
         run: |
           corepack enable

.gitignore

@@ -98,3 +98,4 @@ alice-auth-manager-data
 alice-auth-manager-data
 !/packages/contracts/dist/
 !/packages/contracts/dist/dev
+.secret