feat: allow specifying files to ignore while bundling for a new build

[bart-iconica]

Description

In a project I'm working on we currently use FVM to easily get the right Dart version to develop with. Currently when executing dart_frog build it's .fvm folder gets copied into the build folder, which due to the size on some machine causes timeouts and fails (happens for at least one colleague of mine). And even if it does succeed the whole content is then also copied into the resulting Docker image, needlessly increasing the size of the build.

I would like to have a way to specify which files and folders to ignore while starting a build.

Requirements

• All CI/CD checks are passing.
• There is no drop in the test coverage percentage.

Additional Context

No response

[Luckey-Elijah]

#589 had a similar challenge. I don't see a resolution there but can you try adding a .dockerignore and adding the .fvm/ directory?