build-clouds.ts output sandbox.js not in packages/cli/.gitignore

[samialdury]

Running bun run packages/cli/build-clouds.ts (as cli-release.yml does) produces packages/cli/sandbox.js, but packages/cli/.gitignore lists every other cloud bundle (aws, daytona, digitalocean, gcp, hetzner, local, sprite) and not sandbox.js. The sandbox bundle shows up as an untracked file and can be accidentally committed. One-line fix: add sandbox.js to the "Cloud provider bundles" section of packages/cli/.gitignore.