chore: replace nvmrc with tool-versions and update workflow

Signed-off-by: Rui Chen <rui@chenrui.dev>

.github/workflows/main.yml

@@ -1,14 +1,20 @@
-name: Main
+name: main
 
-on: [pull_request, push]
+on:
+  push:
+  pull_request:
 
 jobs:
   build:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-24.04
     steps:
-      # https://github.com/actions/checkout
-      - name: Checkout
-        uses: actions/checkout@v4
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-node@v4
+        with:
+          node-version-file: ".tool-versions"
+          cache: "npm"
+
       - name: Install
         run: npm ci
       - name: Build

.nvmrc

@@ -1 +0,0 @@
-20.14.0

.tool-versions

@@ -0,0 +1 @@
+nodejs 20.15.1