doc(gctx): cli variable injection

Signed-off-by: Khaled Emara <[email protected]>

content/en/docs/kyverno-cli/usage/apply.md

@@ -516,6 +516,29 @@ echo $?
 3
 ```
 
+You can also inject global context entries using variables. This feature allows for more flexible and dynamic policy testing and execution.
+
+To inject global context entries using the CLI the Values file should contain a `policies` section where you can define the global context entries you want to inject.
+
+Here's an example of a Values file that injects a global context entry:
+
+```yaml
+apiVersion: cli.kyverno.io/v1alpha1
+kind: Value
+metadata:
+  name: values
+globalValues:
+  request.operation: CREATE
+policies:
+  - name: gctx
+    rules:
+      - name: main-deployment-exists
+        values:
+          deploymentCount: 1
+```
+
+In this example, `request.operation` is set as a global value, and `deploymentCount` is set for a specific rule in the `gctx` policy.
+
 ### Policy Report
 
 Policy reports provide information about policy execution and violations. Use `--policy-report` with the `apply` command to generate a policy report for `validate` policies. `mutate` and `generate` policies do not trigger policy reports.