GitHub Actions: The `set-env` command is deprecated and will be disabled soon.

[cclauss]

The set-env command is deprecated and will be disabled soon. Please upgrade to using Environment Files. For more information see: https://github.blog/changelog/2020-10-01-github-actions-deprecating-set-env-and-add-path-commands/

As seen at https://github.com/nodejs/node-gyp/actions

• Node Version:
• Platform:
• Compiler:
• Module:

Verbose output (from npm or node-gyp):

Paste your log here, between the backticks. It can be:
  - npm --verbose output,
  - or contents of npm-debug.log,
  - or output of node-gyp rebuild --verbose.
Include the command you were trying to run.

This should look like this:

>npm --verbose
npm info it worked if it ends with ok
npm verb cli [
npm verb cli   'C:\\...\\node\\13.9.0\\x64\\node.exe',
npm verb cli   'C:\\...\\node\\13.9.0\\x64\\node_modules\\npm\\bin\\npm-cli.js',
npm verb cli   '--verbose'
npm verb cli ]
npm info using npm@6.13.7
npm info using node@v13.9.0

Usage: npm <command>
(...)