``tt build`` command in cartridge app deleted user's ``doc`` directory

[Satbek]

I had cartridge app and wanted to switch to tt instead of cartridge. I ran tt build, it had built, but removed my doc dir.

[psergee]

This issue is due to post-build script invocation. It must be invoked in the pack command after building an app and use temporary app directory as a working dir for the commands in a post-build script.

[Satbek]

cartridge build does not run post-build script, and nothing was deleted after cartridge build

[ArtDu]

I met the same behaviour and was surprised