fix crd customization

[ashithwilson]

make install fails probably due to kustomization file missing. This PR adds it.

Before

❯ make install
Downloading sigs.k8s.io/controller-tools/cmd/[email protected]
/Users/ashith/git/ashithwilson/istio-fortsa/bin/controller-gen-v0.14.0 rbac:roleName=manager-role crd webhook paths="./..." output:crd:artifacts:config=config/crd/bases
Downloading sigs.k8s.io/kustomize/kustomize/[email protected]
/Users/ashith/git/ashithwilson/istio-fortsa/bin/kustomize-v5.3.0 build config/crd | kubectl apply -f -
Error: unable to find one of 'kustomization.yaml', 'kustomization.yml' or 'Kustomization' in directory '/Users/ashith/git/ashithwilson/istio-fortsa/config/crd'
error: no objects passed to apply
make: *** [install] Error 1

After

❯ make install
/Users/ashith/git/ashithwilson/istio-fortsa/bin/controller-gen-v0.14.0 rbac:roleName=manager-role crd webhook paths="./..." output:crd:artifacts:config=config/crd/bases
/Users/ashith/git/ashithwilson/istio-fortsa/bin/kustomize-v5.3.0 build config/crd | kubectl apply -f -
clusterrole.rbac.authorization.k8s.io/manager-role created

[hercynium]

Can you please rebase your branch from main?