Add support for ingress objects

[jordandoig]

This PR adds support for checking Ingress kubernetes objects

[rbren]

This is looking awesome! LMK if you want to chat through the frontend changes at all.

[codecov]

Codecov Report

Merging #469 (93a80e4) into master (ec557f7) will decrease coverage by 0.21%.
The diff coverage is 55.00%.

@@            Coverage Diff             @@
##           master     #469      +/-   ##
==========================================
- Coverage   49.01%   48.80%   -0.22%     
==========================================
  Files          12       13       +1     
  Lines         712      754      +42     
==========================================
+ Hits          349      368      +19     
- Misses        302      317      +15     
- Partials       61       69       +8     

Impacted Files	Coverage Δ
pkg/config/schema.go	11.59% <ø> (ø)
pkg/kube/resources.go	42.56% <22.22%> (-1.53%)	⬇️
pkg/validator/summary.go	42.68% <33.33%> (+0.18%)	⬆️
pkg/validator/controller.go	74.07% <60.00%> (ø)
pkg/validator/ingress.go	60.00% <60.00%> (ø)
pkg/validator/fullaudit.go	51.16% <66.66%> (+1.16%)	⬆️
pkg/validator/schema.go	70.90% <68.42%> (-2.83%)	⬇️

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[rbren]

Looking great! Seems to be a bug when running locally though - I think we need to check if PodResult != nil in a few places.

To test locally, you can run:

kubectl create ns polaris
helm upgrade --install polaris fairwinds-stable/polaris --set dashboard.ingress.enabled=true -n polaris --set dashboard.ingress.hosts[0]="foo.bar.com"
go run main.go dashboard

Probably worth adding a test case to the webhook tests as well