We probably want shellcheck for all the bash scripts we have.
And then it would be good if we could run something like pack create-builder toolforge-builder:testing --config builder.toml --verbose to verify all the configuration is compatible. This would pull the base images and build a new one.
@hashar is it possible for normal jobs to pull/build docker images? We don't actually need to use the images, but verify that pack can build one.