Feature-suggestion: safe-files

[ligi]

Thanks for the project - looks really useful. Currently I have the problem that I need to do a lot of approvals and would love to automate it. Just the "dangerous-files" pattern scares me a bit. Would feel much better with a "safe-files" pattern (can be an alternative to "dangerous-files") - Basically what I want to express in my case: If only json files in a certain folder are changed -> approve