feat: background audit config, severity and category annotations.

Updates policy metadata.yml file adding the new configuration to enabled
background audit checks and adds two new annotations used by the audit
scanner in its reports.

Signed-off-by: José Guilherme Vanz <[email protected]>

metadata.yml

@@ -1,20 +1,27 @@
 rules:
-- apiGroups: [""]
-  apiVersions: ["v1"]
-  resources: ["pods"]
-  operations: ["CREATE"]
+  - apiGroups:
+      - ''
+    apiVersions:
+      - v1
+    resources:
+      - pods
+    operations:
+      - CREATE
 mutating: false
 contextAware: false
 annotations:
   # artifacthub specific
   io.artifacthub.displayName: Sysctl PSP
   io.artifacthub.resources: Pod
   io.artifacthub.keywords: sysctl, psp, pod
+  # kubewarden specific
   io.kubewarden.policy.ociUrl: ghcr.io/kubewarden/policies/sysctl-psp
-  # kubewarden specific:
   io.kubewarden.policy.title: sysctl-psp
-  io.kubewarden.policy.description: A Pod Security Policy that controls usage of sysctls in pods
+  io.kubewarden.policy.description: A Pod Security Policy that controls usage of sysctls
+    in pods
   io.kubewarden.policy.author: Kubewarden developers <[email protected]>
   io.kubewarden.policy.url: https://github.com/kubewarden/sysctl-psp-policy
   io.kubewarden.policy.source: https://github.com/kubewarden/sysctl-psp-policy
   io.kubewarden.policy.license: Apache-2.0
+  io.kubewarden.policy.category: PSP
+  io.kubewarden.policy.severity: medium