[Security] Fix command injection risk in cloudflared installer

[gonzaloriestra]

WHY are these changes introduced?

Fixes a potential command injection vulnerability in the Cloudflare installer. The previous implementation used execSync with a template literal containing a variable derived from an environment variable (SHOPIFY_CLI_CLOUDFLARED_PATH), which could be exploited to execute arbitrary commands if the environment was compromised.

WHAT is this pull request doing?

• Replaces direct child_process.execSync and child_process.execFileSync calls with secure wrappers exec and captureOutputWithExitCode from @shopify/cli-kit/node/system.
• Switched to argument-list-based command execution for tar to prevent shell injection.
• Removed direct child_process imports to ensure all command executions go through @shopify/cli-kit which implements checkCommandSafety.
• Updated unit tests in install-cloudflared.test.ts to match the new asynchronous implementation and use the correct mocks.

How to test your changes?

Run the unit tests for the affected package:

pnpm --filter @shopify/plugin-cloudflare vitest run

Checklist

• I've considered possible cross-platform impacts (Mac, Linux, Windows)
• I've considered possible documentation changes
• I've considered analytics changes to measure impact
• The change is user-facing — I've identified the correct bump type (patch for bug fixes · minor for new features · major for breaking changes) and added a changeset with pnpm changeset add

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PR created automatically by Jules for task 17491907231653004163 started by @gonzaloriestra

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[gonzaloriestra]

/snapit

[github-actions]

🫰✨ Thanks @gonzaloriestra! Your snapshot has been published to npm.

Test the snapshot by installing your package globally:

pnpm i -g --@shopify:registry=https://registry.npmjs.org @shopify/cli@0.0.0-snapshot-20260506091623

Caution

After installing, validate the version by running shopify version in your terminal.
If the versions don't match, you might have multiple global instances installed.
Use which shopify to find out which one you are running and uninstall it.