Extend Gslb CRD with additionalPrinterColumns

[ytsarev]

Use https://book.kubebuilder.io/reference/generating-crd.html#additional-printer-columns
to add additionalPrinterColumns exposing strategy and geoTag of Gslb CR

From the user perspective it looks like

kubectl -n test-gslb get gslb
NAME                 STRATEGY     GEOTAG
test-gslb            roundRobin   eu-west-1
test-gslb-failover   failover     eu-west-1

Signed-off-by: Yury Tsarev yury.tsarev@absa.africa

[k0da]

While there, can we please have host as well?

[ytsarev]

While there, can we please have host as well?

There can be many hosts for the same Gslb also there is a representation type limitation of

 must be one of boolean,date,integer,number,string

So

k -n test-gslb get gslb test-gslb-failover
NAME                 GEOTAG      HEATHYRECORDS                                                            SERVICEHEALTH
test-gslb-failover   eu-west-1   map[failover.test.k8gb.io:[34.254.84.32 52.212.133.90 54.195.241.226]]   map[failover.test.k8gb.io:Healthy]

doesn't look cool

So I don't know how to properly represent the object in the print column.