Previously all binaries were uploaded with the same name 'piglet',
causing them to overwrite each other. Now each binary is renamed
to include the target platform (e.g., piglet-x86_64-unknown-linux-gnu)
before uploading.
This ensures all 4 platform binaries are available in the release.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
Added 'contents: write' permission to allow GITHUB_TOKEN to create
releases. This fixes the 403 error when the workflow tries to create
a GitHub release.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>