Chart: Explicitly set runAsGroup. (#11679)

* Chart: Explicitly set `runAsGroup`.

Set a default value for the runAsGroup in container securityContexts of
the controller and default backend.

Also set the runAsGroup for opentelemetry and webhook Job container
securityContexts.

Signed-off-by: Gerald Pape <gerald@giantswarm.io>

* Apply suggestions from code review

Co-authored-by: Marco Ebert <marco_ebert@icloud.com>

---------

Signed-off-by: Gerald Pape <gerald@giantswarm.io>
Co-authored-by: Marco Ebert <marco_ebert@icloud.com>

charts/ingress-nginx/tests/controller-deployment_test.yaml

@@ -160,3 +160,11 @@ tests:
                         values:
                           - controller
                   topologyKey: kubernetes.io/hostname
+
+  - it: should create a Deployment with `runAsGroup` if `controller.image.runAsGroup` is set
+    set:
+      controller.image.runAsGroup: 1000
+    asserts:
+      - equal:
+          path: spec.template.spec.containers[0].securityContext.runAsGroup
+          value: 1000