Ability to conditionally install components based on state of in-cluster resources

[dexhorthy]

As a simple example, let's say my application requires contour for ingress. It would be cool if there was a programmatic way to detect if it's present, and if not, include it my application. I can obviously do some of this with preflight checks and/or configuration, but there's not presently a good way to populate a kots.io/when annotation with the status of a preflight check or some other function that checks for the presence of resources in the cluster.

[sgraham785]

i am the one the originally reported this request to Dex. the addition of a feature like this would greatly help in the gaps that occur from an embedded install to an existing cluster. we have run into this with storage and ingress, since initially we coded to support contour and rook-ceph but have no way of ensuring that it's actually installed if not present on a clients existing cluster