chore(build): use bun instead of node

.github/actions/ci-setup-rails/action.yml

@@ -14,17 +14,11 @@ runs:
         ruby --yjit -v
       shell: bash
 
-
-    - name: Setup Node
-      uses: actions/setup-node@v4
-      with:
-        node-version-file: '.node-version'
     - name: Setup Bun
       uses: oven-sh/setup-bun@v1
 
     - name: Install Node modules
       run: |
-        node --version
         bun --version
         bun install
       shell: bash