add setup action

Author: timkpaine

.github/dependabot.yml

@@ -0,0 +1,7 @@
+version: 2
+updates:
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+    labels: []

.github/workflows/build.yml

@@ -0,0 +1,36 @@
+name: Build Status
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+  workflow_dispatch:
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.head_ref || github.run_id }}
+  cancel-in-progress: true
+
+permissions:
+  checks: write
+  pull-requests: write
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v4
+
+    - name: Prework
+      run: |
+        echo '{"name": "a", "version": "0.0.0", "scripts": {}}' > package.json
+        printf 'lockfileVersion: '9.0'\nsettings:\n\tautoInstallPeers: true\n\texcludeLinksFromLockfile: false\nimporters:\n.: {}' > pnpm-lock.yaml
+
+    - name: Setup Node
+      uses: actions-ext/node/setup@main
+      with:
+        version: '20.x'
+
+    - name: Install
+      run: pnpm install

README.md

@@ -1,2 +1,6 @@
 # node
-Helper actions for node projects
+Helper actions for Node projects
+
+| Name | Action Reference | Description |
+|:-----|:-----------------|:------------|
+| [setup](./setup) | actions-ext/node/setup | Setup Node with `pnpm` and caching |

setup/README.md

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+# setup
+An action to setup Node with `pnpm` and caching.
+
+## Usage
+
+The following example yaml code will setup Node 20.x environment with pnpm and caching `pnpm-lock.yaml`.
+
+```yaml
+- name: Setup Node
+  uses: actions-ext/node/setup@v1
+  with:
+    manager: pnpm
+    version: '20.x'
+```

setup/action.yml

@@ -0,0 +1,31 @@
+name: Setup Node
+description: 'Ensure NNode is installed, and setup pnpm with caching'
+
+inputs:
+  version:
+    type: choice
+    description: "Version to install"
+    options:
+      - '20.x'
+      - '22.x'
+    default: '20.x'
+  package_json_file:
+    type: string
+    description: 'Path to package.json'
+    default: 'js/package.json'
+
+runs:
+  using: 'composite'
+  steps:
+    - name: Install pnpm
+      uses: pnpm/action-setup@v4
+      with:
+        version: 9
+        package_json_file: ${{ inputs.package_json_file }}
+
+    - name: Set up Node ${{ inputs.version }}
+      uses: actions/setup-node@v4
+      with:
+        node-version: ${{ inputs.version }}
+        cache: pnpm
+        cache-dependency-path: '**/pnpm-lock.yaml'