Add parameter to output stricter schema

[estahn]

I would like to have the ability to run the tool and get a schema that already has "additionalProperties": false, defined for all objects. In this case, I can run helm lint against various values files and already see it failing.

helm schema-gen --strict values.yaml

[karuppiah7890]

Hey! Sorry, I have been caught up with multiple things, so I have not been able to reply to issues / write code for this project. I'm not exactly planning on building more into the tool. This was more of a side project 😅 To be fair, I wasn't even using this at work because at the time I wrote the tool, we were still using Helm v2. I had just written the tool wondering that we could try using it / taking it for a spin when we want to migrate to Helm v3 and try using the schema feature

I would recommend forking and using the repo, I'm guessing you or others might already be doing this