Change default node-version-file to package.json (#6)

* Change default node-version-file to package.json

* Add node version

* Update README

* Remove node version

* Update readme

* Use latest setup-node

Author: NullVoxPopuli

README.md

@@ -38,6 +38,19 @@ Allows changing the `node-version` passed to `actions/setup-node`.
     node-version: 18
 ```
 
+### `node-version-file`
+
+Allows changing the `node-version-file` passed to `actions/setup-node`.
+
+The default has changed from `actions/setup-node`'s `''` to `'package.json'`, enabling easy volta usage with 0 configuration for consumers of `wyvox/action-setup-pnpm`.
+_not_ providing a volta config also have 0 consequence.
+
+```yaml
+- uses: wyvox/action-setup-pnpm@v3
+  with:
+    node-version-file: '.node-version'
+```
+
 ### `node-registry-url`
 
 Allows changing the `registry-url` passed to `actions/setup-node`.
@@ -82,7 +95,7 @@ steps:
   - uses: pnpm/action-setup@v2
     with:
       version: 8
-  - uses: actions/setup-node@v3
+  - uses: actions/setup-node@v4
     with:
       cache: 'pnpm'
   - run: pnpm install

action.yml

@@ -8,6 +8,10 @@ inputs:
   node-version:
     description: "Override the default node version, or override what is specified in your project's volta config"
     required: false
+  node-version-file: 
+    description: "Override where the default node version is read from. By default this reads from package.json, which includes support for volta.node. Specifying node-version will override this"
+    required: false
+    default: 'package.json'
   node-registry-url:
     description: "Optional registry to set up for auth. Will set the registry in a project level .npmrc and .yarnrc file, and set up auth to read in from env.NODE_AUTH_TOKEN."
     required: false
@@ -118,10 +122,13 @@ runs:
     #     Note also that volta's action does not have formal support for pnpm, nor its cache.
     # - does not install pnpm
     - name: 'Setup node and the cache for pnpm'
-      uses: actions/setup-node@v3
+      uses: actions/setup-node@v4
       with:
         cache: 'pnpm'
+        # If specified, takes precedence over node-version-file
         node-version: ${{ inputs.node-version }}
+        # Default node version read from package.json, but can be changed by passing in inputs.node-version-file
+        node-version-file: ${{ inputs.node-version-file }}
         registry-url: ${{ inputs.node-registry-url }}
 
     # It's only efficient to install dependencies