## Summary
Adds a new CLI flag `--compile-executable-path` that allows specifying a
custom Bun executable path for cross-compilation instead of downloading
from the npm registry.
## Usage
```bash
bun build --compile --target=bun-linux-x64 \
--compile-executable-path=/path/to/bun-linux-x64 app.ts
```
## Motivation
The `executablePath` option was already available in the JavaScript
`Bun.build()` API. This exposes the same functionality from the CLI.
## Changes
- Added `--compile-executable-path <STR>` CLI parameter in
`src/cli/Arguments.zig`
- Added `compile_executable_path` field to `BundlerOptions` in
`src/cli.zig`
- Wired the option through to `StandaloneModuleGraph.toExecutable()` in
`src/cli/build_command.zig`
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Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>
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