Add GitHub API authentication to avoid rate limit errors

[r4y7s]

Problem

The script makes unauthenticated requests to the GitHub API, which causes 403 rate limit errors when running frequently in CI/CD:

HTTP Error fetching latest GitHub release: 403 403 Client Error: rate limit exceeded

Example: https://github.com/CaddyBuilds/caddy-cloudflare/actions/runs/18362086185

Unauthenticated requests are limited to 60/hour, while authenticated requests get 5,000/hour.

Solution

Added support for the GITHUB_TOKEN environment variable to authenticate requests. The script falls back gracefully to unauthenticated requests if the token is not provided.

Usage

In GitHub Actions workflows:

The GITHUB_TOKEN is automatically provided by GitHub Actions and requires no additional configuration.

Changes

• Read GITHUB_TOKEN from environment
• Add Authorization header when token is available
• Add logging to indicate authentication status

This is fully backward compatible and eliminates rate limit issues.