feat: added skip-cache flag for images

[DmitriyLewen]

added boolean flag skip-cache to skip cache when scanning images.

[knqyf263]

What motivates you to add this feature?

[AndreyLevchenko]

What motivates you to add this feature?

Hi @knqyf263
I was going to ask you about it. I'm 100% agree it has no value for customers. But we would love to use it while debuging issues. It would exclude extra step for removing fanal cache. If I miss this step accidentally it can lead investigations to a wrong path.

[knqyf263]

$ trivy image --clear-cache && trivy image [YOUR_COMMAND]
doesn't work for you? I think we might be missing --skip-cache as well.

[AndreyLevchenko]

I suspect it won't work in some debug configs. It could be something other then cmd option but it would be nice to have cache bypass logic

[knqyf263]

I suspect it won't work in some debug configs.

Could you give me some examples? I still don't get your point. --clear-cache has been working for me.