add: flag skip-flutter-build

[dyno-nexsoft]

Description

This pull request introduces a new CLI flag --skip-flutter-build that allows users to bypass the Flutter build step when bundling installers. It also improves subprocess execution compatibility on Windows and refines spinner suppression logic for a better user experience in quiet mode.

Type of Change

• New Feature (feat)
• Bug Fix (fix)
• Documentation (docs)
• Other (please specify):

Detailed Changes

• Added support for the --skip-flutter-build CLI flag.
• Improved subprocess execution compatibility on Windows.
• Fixed issue where spinner output was incorrectly shown.
• Updated CHANGELOG.md to reflect these changes.

Checklist

• Code has been tested (Windows 11 26100.4770)
• Documentation has been updated
• No changes affect the public API (if applicable)
• All unit and integration tests pass

Screenshots

❯ dart run inno_build --help
Building package executable... (2.7s)
Built inno_build:inno_build.
╔════════════════════════════════════════════════════════════════════╗
║                     ✨✨   INNO BUILD   ✨✨                     ║
╚════════════════════════════════════════════════════════════════════╝
Usage: inno_build [options]
Options (for generate command):
  -a, --app-id              Generate a new InnoSetup AppID.
      --release             Generate the application in release mode (default).
  -d, --debug               Generate the application in debug mode.
      --skip-flutter-build  Skip the Flutter build step.

Global Options:
  -h, --help                Show this help message.
  -v, --version             Show version information.
      --verbose             Enable verbose output.
  -q, --quiet               Suppress output (quiet mode).
  -i, --install             Install Inno Setup if not already installed.

[dyno-nexsoft]

I want flutter build with custom agrs but inno_build auto rebuild again

[izzalDev]

Thanks @dyno-nexsoft,

Nice work! I made a few small tweaks (like making sure the spinner appears in verbose mode), and everything works as expected. I'm merging this now — it will be included in version 0.4.0, which should be out in the next few days. 🚀

Thanks again for your contribution and your patience! 👍