Feature request: ArgoCD dry run

[sthomson-wyn]

It would be neat if kubechecks ran a dry sync with the argocd CLI.

https://argo-cd.readthedocs.io/en/stable/user-guide/commands/argocd_app_sync/

Flags of interest:
--dry-run
--local
--server-side

If this works how I think it does, this would allow users to identify things like validating webhook violations at PR time, rather than deploy time

[djeebus]

Very interesting, I like the idea!

[MeNsaaH]

Yeah, I stumbled unto this when I was searching for how to validating webhook. I remember bumping into an issue that delayed my progress:

1. It doesn't work for new resources, see Improve argocd app sync --dry-run for Applications with New Resources argoproj/argo-cd#21660
2. It sorta modifies the actual application - I need to retest this and verify though. But I noticed this wild behaviour where argocd sync --dry-run updated the actual app, and in most cases left that app out-of-sync.

I'll hopefully be working on this feature soon