Add Linux support to ado-npm-auth and node-azureauth

[sverrejoh]

Summary

Enables native Linux (x64 and arm64) support for automatic Azure DevOps authentication. The azureauth CLI already provides Linux binaries (v0.8.4+), but the wrapper packages were blocking Linux users.

Changes

packages/ado-npm-auth

• Added linux: ["x64", "arm64"] to supported platforms in is-supported-platform-and-architecture.ts
• Updated JSDoc to reflect Linux support

packages/node-azureauth

• Added linux: ["x64", "arm64"] to supported platforms
• Fixed AZUREAUTH_NAME_MAP for Linux (binary name is azureauth, not azureauth.exe)
• Added Linux .deb download support to DOWNLOAD_MAP:
  • azureauth-0.8.4-linux-x64.deb
  • azureauth-0.8.4-linux-arm64.deb
• Implemented extractDeb() function to handle Debian package extraction:
  • Extracts ar archive
  • Finds and extracts data.tar.*
  • Copies all files from /usr/lib/azureauth/ to install directory
  • Sets proper permissions (0o755)

Testing

Tested on Arch Linux x64:

• ✅ Binary downloads successfully (v0.8.4)
• ✅ Binary extracts and installs correctly
• ✅ Authentication completes successfully
• ✅ No regression for Windows/macOS/WSL (WSL still uses Windows .exe via interop)

Before/After

Before: Linux users see "Platform linux and architecture x64 not supported" error
After: Linux users can use npm exec azureauth for automatic authentication

Notes

• WSL continues to use Windows executable (azureauth.exe) via WSL interop as before
• Only native Linux distributions benefit from this change
• Requires ar and tar commands (standard on all Linux distributions)

[dannyvv]

I created an alternative implementation for linux: #77 (even though yours implementation is a lot cleaner) I'm awaiting feedback from repo owners on their view which approach to take. My concern is that linux support is dropped in v9 of azureauth.

There is a chance that internally at Microsoft at some point in the future we have to move to v9 because it supports a later MSAL library.

[sverrejoh]

I created an alternative implementation for linux: #77 (even though yours implementation is a lot cleaner) I'm awaiting feedback from repo owners on their view which approach to take. My concern is that linux support is dropped in v9 of azureauth.

There is a chance that internally at Microsoft at some point in the future we have to move to v9 because it supports a later MSAL library.!

Super! Then I'll test it and abandon this PR. Thanks for the great work!