rpk: fallback to profile's admin address in k8s bundle

Clusters deployed with helm/operator will now
have the rpk section of the redpanda.yaml filled
with the Admin API addresses of the cluster. We
fallback to these addresses in case rpk can't
discover the API addresses using the k8s API.

src/go/rpk/pkg/cli/debug/bundle/bundle_k8s_linux.go

@@ -86,7 +86,14 @@ func executeK8SBundle(ctx context.Context, bp bundleParams) error {
 		zap.L().Sugar().Debugf("unable to get admin API addresses from the k8s API: %v", err)
 	}
 	if len(adminAddresses) == 0 {
-		adminAddresses = []string{fmt.Sprintf("127.0.0.1:%v", config.DefaultAdminPort)}
+		if len(bp.p.AdminAPI.Addresses) > 0 {
+			zap.L().Sugar().Debugf("using admin API addresses from profile: %v", bp.p.AdminAPI.Addresses)
+			adminAddresses = bp.p.AdminAPI.Addresses
+		} else {
+			defaultAddress := fmt.Sprintf("127.0.0.1:%v", config.DefaultAdminPort)
+			zap.L().Sugar().Debugf("profile empty, using %v for the Admin API address", defaultAddress)
+			adminAddresses = []string{defaultAddress}
+		}
 	}
 	steps = append(steps, []step{
 		saveClusterAdminAPICalls(ctx, ps, bp.fs, bp.p, adminAddresses, bp.partitions),