Support for dry-run/generate-only mode

[csakshaug]

When working with ofc-bootstrap in a daily based for developing but also make it ready for production through more automation, it could be helpful to execute the ofc-bootstrap, so it only updates the tmp/generated-* files and runs them with dry-run.

Expected Behaviour

The ./tmp/generated-* files will be updated
Nothing is apply to the cluster/installation

Current Behaviour

Today you either need to a manually update of files or run the ofc-bootstrap with everything

Possible Solution

It could perhaps be nice to have optional both --dry/--dry-run and --generate/--generate-only where you can choose if you want only to generate files or execute a dry run or both.

Context

I want to have more flexibility to the behaviour to ofc-boostrap and init.yml. I am looking at how we can automate the steps before ofc-bootstrap like populate the init.yml file faster and without so much friction.