v2.5.0 breaks existing builds installing newer versions of nodejs

[cesarizu]

Description:
With v2.5.0 existing repos that specify a node version on package.json and/or .nvmrc but do not use node-version-file will start using newer versions of nodejs than the requested.

Action version:
v2.5.0

Platform:

• Ubuntu
• macOS
• Windows

Runner type:

• Hosted
• Self-hosted

Tools version:
Nodejs v14

Repro steps:
Create a repo with a .github/workflows/test.yml that includes:

    - name: Set up Node.js
      uses: actions/setup-node@v2

And set package.json to use:

  "engines": {
    "node": "14.x"
  }

And .nvmrc to use:

v14

Expected behavior:
Version 14 is installed

Actual behavior:
Version 16 is installed

[dmitry-shibanov]

Hello @cesarizu. Thank you for your report. Changes in 2.5.0 release are not related to the issue. If no input node-version or node-version-file is specified, the default Nodejs version from the image will be used. Hosted images updated default Nodejs version to 16.
For now I'm closing the issue, because it's an expected behaviour. If you have any concerns feel free to ping us.