Add option to ignore containers to pull

[JakobFels]

What

Add a new option to skip containers to pull. This is my first time writing rust, so feedback is appreciated.

Why

Tools like rancher-desktop add containers that cannot be pulled, resulting in errors.
This option allows to skip containers like these.

Standards checklist:

• The PR title is descriptive.
• I have read CONTRIBUTING.md
• The code compiles (cargo build)
• The code passes rustfmt (cargo fmt)
• The code passes clippy (cargo clippy)
• The code passes tests (cargo test)
• Optional: I have tested the code myself

[JakobFels]

Seems like containers.rs had crlf line endings, if needed I can revert the conversion to lf

[SteveLauC]

Seems like containers.rs had crlf line endings, if needed I can revert the conversion to lf

Yeah, that would be good

[JakobFels]

I restored the original line endings.

[SteveLauC]

Other changes LGTM, thanks! :)

[SteveLauC]

Thanks! And congratulations on your first contribution to Topgrade!