Added validation webhook,cert-manager,and updated Makefile.

- Scaffolded a new validation webhook using operator-sdk
- Added manifests for webhook.
- Added manifests for self signed issuer and certificates
- Added a new spec named ValidateSecurityWarnings to the Jenkins custom resource definition to enable/disable security check.
- Updated Makefile to deploy the operator locally.
- Updated helm template and default values.yaml

config/crd/bases/jenkins.io_jenkins.yaml

@@ -35,6 +35,10 @@ spec:
           spec:
             description: Spec defines the desired state of the Jenkins
             properties:
+              ValidateSecurityWarnings:
+                description: ValidateSecurityWarnings enables or disables validating
+                  potential security warnings in Jenkins plugins via admission webhooks.
+                type: boolean
               backup:
                 description: 'Backup defines configuration of Jenkins backup More
                   info: https://jenkinsci.github.io/kubernetes-operator/docs/getting-started/latest/configure-backup-and-restore/'

config/webhook/manifests.yaml

@@ -0,0 +1,29 @@
+
+---
+apiVersion: admissionregistration.k8s.io/v1
+kind: ValidatingWebhookConfiguration
+metadata:
+  creationTimestamp: null
+  name: validating-webhook-configuration
+webhooks:
+- admissionReviewVersions:
+  - v1
+  - v1beta1
+  clientConfig:
+    service:
+      name: webhook-service
+      namespace: system
+      path: /validate-jenkins-io-jenkins-io-v1alpha2-jenkins
+  failurePolicy: Fail
+  name: vjenkins.kb.io
+  rules:
+  - apiGroups:
+    - jenkins.io.jenkins.io
+    apiVersions:
+    - v1alpha2
+    operations:
+    - CREATE
+    - UPDATE
+    resources:
+    - jenkins
+  sideEffects: None

config/webhook/service.yaml

@@ -0,0 +1,12 @@
+
+apiVersion: v1
+kind: Service
+metadata:
+  name: webhook-service
+  namespace: system
+spec:
+  ports:
+    - port: 443
+      targetPort: 9443
+  selector:
+    control-plane: controller-manager