Feature: Diagnostics/Telemetry

[sgammon]

Summary

This changeset adds several diagnostics and telemetry features, which will be used to drive UI on the Buildless Cloud, and to surface issues to the end-user, integrated with the Github Action.

Several other features landed on the way:

• Ability to detect Buildless API key by env (in addition to option)
• Resolution of identity token for event submission
• XZ-based archives, which are smaller
• Error reporting with Sentry
• Basic install / agent run events

Telemetry Features

The telemetry sent with these calls is extremely minimal, and listed exhaustively below. The only API keys or other credentials that are read and transmitted are (1) the ID token for the Actions workflow, acquired only if permission is granted, and (2) the Buildless API key or auth token, as applicable.

• Job number
• Job ID
• Workflow SHA
• Workflow Name
• Target SHA
• Runner OS, Image, Architecture
• Buildless Instance ID
• Action Invocation ID
• Action Reference

These values should be safe and all have clear use within the error/warning UI within Buildless. At a later time, if requested, we may add an option to remove such telemetry, or add sampling.

Changelog

• feat: env variable fallbacks
• feat: resolve id token gracefully
• feat: xz archive support
• feat: error reporting via sentry
• feat: telemetry / diagnostics infra