Add comprehensive GitHub Copilot instructions for the repository - #375

Unexpected input(s) 'node_version', valid inputs are ['always-auth', 'node-version', 'node-version-file', 'architecture', 'check-latest', 'registry-url', 'scope', 'token', 'cache', 'package-manager-cache', 'cache-dependency-path', 'mirror', 'mirror-token']

The `set-output` command is deprecated and will be disabled soon. Please upgrade to using Environment Files. For more information see: https://github.blog/changelog/2022-10-11-github-actions-deprecating-save-state-and-set-output-commands/