jenkins: Add CronJob for updatecheck

`updatecheck` is a little utility I wrote that queries Fedora Bodhi for
updates and sends an HTTP request when one is found.  I am specifically
going to use it to trigger rebuilding the _gasket-driver_ RPM whenever
there is a new _kernel_ published.

jenkins/kustomization.yaml

@@ -11,6 +11,18 @@ resources:
 - iscsi.yaml
 - ssh-host-keys
 - workspace-volume.yaml
+- updatecheck.yaml
+
+configMapGenerator:
+- name: updatecheck
+  namespace: jenkins
+  files:
+  - config.toml=updatecheck.toml
+  options:
+    disableNameSuffixHash: true
+    labels:
+      app.kubernetes.io/name: updatecheck
+      app.kubernetes.io/component: updatecheck
 
 patches:
 - patch: |
@@ -23,6 +35,15 @@ patches:
       volumeName: jenkins
       storageClassName: ''
 
+- patch: |
+    apiVersion: v1
+    kind: PersistentVolumeClaim
+    metadata:
+      name: updatecheck
+      namespace: jenkins
+    spec:
+      storageClassName: synology-iscsi
+
 images:
 - name: docker.io/jenkins/jenkins
   newTag: 2.528.2-lts