Fix 2 panics

* type asseration for pod deleted might panic with `panic: interface conversion: interface {} is cache.DeletedFinalStateUnknown, not *v1.Pod`
* client-go might panic trying to modify kubeconfig with go 1.18 and reflect < 1.0.2

Author: databus23

go.mod

@@ -38,6 +38,7 @@ require (
 	github.com/imdario/mergo v0.3.11
 	github.com/joeshaw/envdecode v0.0.0-20170502020559-6326cbed175e
 	github.com/justinas/alice v0.0.0-20171023064455-03f45bd4b7da
+	github.com/modern-go/reflect2 v1.0.2 // indirect
 	github.com/oklog/run v1.0.1-0.20180308005104-6934b124db28
 	github.com/pkg/errors v0.9.1
 	github.com/pmylund/go-cache v2.1.0+incompatible // indirect

go.sum

@@ -605,6 +605,8 @@ github.com/modern-go/reflect2 v0.0.0-20180320133207-05fbef0ca5da/go.mod h1:bx2lN
 github.com/modern-go/reflect2 v0.0.0-20180701023420-4b7aa43c6742/go.mod h1:bx2lNnkwVCuqBIxFjflWJWanXIb3RllmbCylyMrvgv0=
 github.com/modern-go/reflect2 v1.0.1 h1:9f412s+6RmYXLWZSEzVVgPGK7C2PphHj5RJrvfx9AWI=
 github.com/modern-go/reflect2 v1.0.1/go.mod h1:bx2lNnkwVCuqBIxFjflWJWanXIb3RllmbCylyMrvgv0=
+github.com/modern-go/reflect2 v1.0.2 h1:xBagoLtFs94CBntxluKeaWgTMpvLxC4ur3nMaC9Gz0M=
+github.com/modern-go/reflect2 v1.0.2/go.mod h1:yWuevngMOJpCy52FWWMvUC8ws7m/LJsjYzDa0/r8luk=
 github.com/monochromegane/go-gitignore v0.0.0-20200626010858-205db1a8cc00 h1:n6/2gBQ3RWajuToeY6ZtZTIKv2v7ThUy5KKusIT0yc0=
 github.com/monochromegane/go-gitignore v0.0.0-20200626010858-205db1a8cc00/go.mod h1:Pm3mSP3c5uWn86xMLZ5Sa7JB9GsEZySvHYXCTK4E9q4=
 github.com/morikuni/aec v1.0.0 h1:nP9CBfwrvYnBRgY6qfDQkygYDmYwOilePFkwzv4dU8A=

pkg/controller/ground.go

@@ -1028,6 +1028,9 @@ func (op *GroundControl) podAdd(obj interface{}) {
 }
 
 func (op *GroundControl) podDelete(obj interface{}) {
+	if deleted, ok := obj.(cache.DeletedFinalStateUnknown); ok {
+		obj = deleted.Obj
+	}
 	pod := obj.(*api_v1.Pod)
 	if klusterName, found := pod.GetLabels()["release"]; found && len(klusterName) > 0 {
 		klusterKey := pod.GetNamespace() + "/" + klusterName