feat: add support node is an alias for the latest version

https://github.com/nvm-sh/nvm#usage

.github/workflows/versions.yml

@@ -43,6 +43,20 @@ jobs:
         with:
           node-version: ${{ matrix.node-version }}
 
+  latest-syntax:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest, windows-latest, macos-latest]
+        node-version: [node]
+    steps:
+      - uses: actions/checkout@v2
+      - name: Setup Node
+        uses: ./
+        with:
+          node-version: ${{ matrix.node-version }}
+
   manifest:
     runs-on: ${{ matrix.os }}
     strategy:

src/installer.ts

@@ -373,6 +373,10 @@ async function queryDistForMatch(
   let versions: string[] = [];
   let nodeVersions = await getVersionsFromDist();
 
+  if (versionSpec === 'node') {
+    return nodeVersions[0].version;
+  }
+
   nodeVersions.forEach((nodeVersion: INodeVersion) => {
     // ensure this version supports your os and platform
     if (nodeVersion.files.indexOf(dataFileName) >= 0) {